#geometry-and-trigonometry

1 messages · Page 91 of 1

steady wyvern
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Hi

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$|A^n|=|A|^n$

somber coyoteBOT
steady wyvern
obsidian harness
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You could let B = A here

summer hedge
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Anyone know how to solve this pls?

summer hedge
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Nvm

copper gate
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so i m in 10th grade and i suck in geometry any tips pls?

dark sparrow
sweet spruce
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Ok thanks

split tide
tame scarab
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Hi guys
how i find the alpha on the question a) and c)?

obsidian harness
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for part a, the sum of the angles equals 90

solve for x then alpha = x + 40

topaz shore
obsidian harness
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for part c, you must have x + y = 2x - y (vertically opposite)

topaz shore
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its prob just to throw you off

obsidian harness
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you also must have x + y + 4x - 2y = 180, or 4x - 2y + 2x - y = 180

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use either one

obsidian harness
topaz shore
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treat alpha as y or any other variable

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idk why the person writing the question felt the need to use alpha

topaz shore
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solve for x

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then you can get alpha

dark sparrow
obsidian harness
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they asked before

dark sparrow
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guh

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i mean there is a trig-free solution

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i think?

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yeah, there is.

mellow merlin
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Why is the formula of a circle x^2 + y^2 = r^2? ik it has something to do with the pythagoream theorem but when i visualize something like this equation i think of

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like i cannot visualize how the pythagorean theorem forms a circle

dark sparrow
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do you know how to find the distance between two points on the xy plane?

mellow merlin
dark sparrow
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right

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$x^2 + y^2 = r^2$ says that the distance between the points $(x,y)$ and $(0,0)$ is $r$

somber coyoteBOT
mellow merlin
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why does it go all around tho

cunning lion
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the circle is the set of all points of a distance r (that distance being the radius) from the center. they can be that far away in any direction

mellow merlin
# somber coyote **Ann**

also wdym by between (x,y) and (0,0) i thought x and y is basically 0 until you shift them around like (x + 3)^2 + (y+3)^2

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like the center of the circle

dark sparrow
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no, (x,y) is a point on the curve

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all cartesian equations are conditions placed upon an arbitrary point (x,y) on the plane

mellow merlin
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i think i need a 3blue1brown vid 4 this 😭 🙏

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i get the equation but how it works i dont get

cunning lion
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the equation for a circle centered at the origin is
[ x^2 + y^2 = r^2 ]
where $r$ is the radius.
\begin{itemize}
\item The set of all points $(x,y)$ satisfying this equation is the circle.
\item $\sqrt{x^2 + y^2}$ is the distance from the origin $(0,0)$ to the arbitrary point $(x,y)$ according to the pythagorean theorem.
\item Therefore, the set of points $(x,y)$ satisfying this equation is exactly the points which are a distance $r$ from the origin.
\item if you drew a straight line from the center (origin) to any point on the circle, its length would be the distance between them. this line segment is called a radius of the circle.
\end{itemize}

somber coyoteBOT
cunning lion
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so r is the radius of the circle

mellow merlin
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hmm maybe its the (x, y) thing thats making me confused on how to visualize it

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i get what ur saying on how (x,y) satisfies the equation but should i think of it as a function or something else

cunning lion
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if you were to pick any point on the circle then its coordinates would satisfy the equation

mellow merlin
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like -√(x^2 - r^2) = y or something

cunning lion
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as well, any point which is not on the circle would have its coordinates fail the equation

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so the circle is just the set of points whose coordinates make the equation true

mellow merlin
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but its still kinda hard to like visualize it intuitively

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but i get what ur saying 🙏

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its just that this is what i see when i try to imagine the equation

cunning lion
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,tikz
\draw (0,0) nodecirc{} node[above right]{$(0,0)$} -- node[midway, below right]{$r$} (235:2) nodecirc{} node[below left]{$(x,y)$};
\draw[dashed] (O) -- node[midway, above]{$x$} (O -| P) coordinate(X) -- node[midway, left]{$y$} (P);
\draw (O) circle[radius = 2];
\path pic[draw, angle radius = 5]{right angle=P--X--O};

somber coyoteBOT
hazy hare
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Can somebody give me the statements aligned with the reasoning

mellow merlin
hazy hare
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no

mellow merlin
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show the statement list

hazy hare
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ok

mellow merlin
hazy hare
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The xyzs are just variables to fill in the actual variables (BADCE)

mellow merlin
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im gonna ignore variables 4 now
so you know that BA and CD are equal right
and
AD and BC is the also equal

what triangles can u make with that so AC and BD can bisect each other

hazy hare
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it already shows AD and BC are congruent

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the only triangles i can make so AC and BD bisect is

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⃤ BDC and. ⃤ . DBA ?

mellow merlin
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and also what other triangle can we make here

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we can also do

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do u know where im going with this?

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@hazy hare

hazy hare
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oh my bad

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didnt see

mellow merlin
mellow merlin
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you were right

hazy hare
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oh

mellow merlin
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ok i thought it through

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so we want to make 4 congruent trianges

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ABC = CDA
and
ABD = BCD

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and we know that these triangles r congruent to each other due to SSS, they share a side with each other and they have 2 other corresponding sides

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and now we want to prove that BE = ED and CE = AE with these triangles

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so the first step would be to make <CEB and <AED congruent since theyre vertical angles

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and we know BA is pararell with CD and BC is pararell with AD because their triangles share the same angle so we can use interior angles

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so with this we know that they are pararell, and angle CAD and ACB are congruent because of alternate interior angles

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and because they share all angles and a side, by AAS congruence they are the same triangles, so therefore BD bisects CA

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since theyre the same triangles and corresponding sides share the same length

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sorry if my explaination was kinda bad but i hope it gives u some insight

so basically whenever a question asks u to prove BD and AC (or anything like that) bisects inside a parellelogram just create congruent triangles, and try to make BCE and AED (or anything like that) or you could even find CED or BEA congruent

it proves that they bisect each other because well if you have congruent triangles, they have the same side lengths right? so if you have 2 of them then the definition of bisect is divide into 2 equally, and since they have the same side length then it proves that they bisect

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@hazy hare

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also u should ask in the help channels next time instead of here since its way faster

visual elk
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Who created maths my head is aching me from just a maths question!

dark sparrow
steady wyvern
obsidian harness
# steady wyvern Excuse me why detA det B=detAB?

The determinant measures how much volumes change during a transformation.
Help fund future projects: https://www.patreon.com/3blue1brown
An equally valuable form of support is to simply share some of the videos.
Home page: https://www.3blue1brown.com/

Full series: http://3b1b.co/eola

Future series like this are funded by the community, throug...

▶ Play video
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the determinant is the area/(hyper)volume scale factor

spark heron
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yo does anyone know any good geometry vids to watch on youtube

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i try to look but cant find any on the topic i am being tested on tommorrow

worn scroll
frank rivet
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How to dtetermine the value of a(strech) in the vertex form of parabolas by looking at its graph? Y= a(X-h)^(2)+k

dark sparrow
frank rivet
dark sparrow
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...

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ok, that makes no sense.

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!xy

lime crownBOT
#

Please show the original problem, exactly as it was stated to you, with the entire original context. A picture or screenshot is best. If the original problem is not in English, then post it anyway! The additional context might still be helpful. Do your best to provide a translation.

frank rivet
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Nvm, let it be

steady wyvern
sudden solstice
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Guys I need help pls 🥺

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I have a test on this soon and dont understand

main wyvern
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what don't you understand?

sudden solstice
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What ever this thing is

silent plank
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do you know your parallel line theorems?

sudden solstice
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I think so but like this is a new looking one to me like what is point a looking at?

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Like I don’t understand what I do to get the answers

silent plank
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they're looking for that angle

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start with what's given and start doing some angle chasing and see where that leads you

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see if you can get any new info from the position of that 62° angle

sudden solstice
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@silent plank there either gonna be corresponding or alternate exterior right

silent plank
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you can do many things with that 62°

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you can do them all if you want

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it won't hurt to get more info, even if some might not be needed

sudden solstice
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So like vaule of X is 16 cause 80/5 is 16 and cause there vertical there equal

silent plank
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yes

sudden solstice
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And value of y is 62 cause it’s alternate exterior

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Just don’t know what a is

silent plank
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y isn't 62

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alternate exterior is applicable here,
but that angle at the bottom isn't y

sudden solstice
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I am confused then

silent plank
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why do you think just y is 62

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tell me which angle the 62° is alternate exterior to

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don't overthink

sudden solstice
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Erm

silent plank
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it looks like you tried to apply it, you just weren't careful

sudden solstice
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2y?

silent plank
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yes

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so 2y = 62, not y

sudden solstice
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Oh

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I stupid ☠️

silent plank
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as for A, don't forget
angle sum on a line / linear pair

sudden solstice
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What does that mean

silent plank
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its a common geometric property

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one you should know and have encountered before being introduced to parallel lines

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how big is that red angle

sudden solstice
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Linear pair they =180

silent plank
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the sum will be 180° yes

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apply that

sudden solstice
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A=118

silent plank
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yes

sudden solstice
lime girder
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You guys are funny

dark sparrow
neon prairie
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Please avoid posting huge emojis that take up tons of screen space

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For mobile users it makes the channel hard to use.

hybrid belfry
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If the definition of a straight line segment is the shortest path from a point to another,
then is there any way to rigorously prove that there's no other distinct straight line segment which connect exact those 2 points?

(By the way, i don't care what kind of method or definition you wanna use, as long as it works 😄)

upper karma
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trigonometry is scary

upper karma
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if not i am cooked.

burnt yoke
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I'm not sure if this is the right place to ask but how do I find out lenght of 2 if 1 is 1425?

cloud night
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but i forgor

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a^2+b^2=c^2

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ur prolly gonna need that

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pythagoreans theorem

burnt yoke
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well thank u for the answer but I still got no idea how to solve it

maiden brook
sudden solstice
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Guys can you help me understand this please I am Cooked on this test if I don’t know this

solid needle
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understand what

waxen temple
ionic depot
#

In this video we will look previous years trigonometric questions asked in boards.
It will give better insight of how questions come from this chapter in 10th class final boards examination.

How to solve Probability questions ✍️🤔
#class10
#trignometry
#youtube
#youtuber
#subscribe
#class10
#guess
#boards
#boardexam
#trignomentry
#trigno...

▶ Play video
burnt yoke
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and then?

worn scroll
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a little bit of trig

wise zodiac
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if so, you can find the side length from law of cosines with 1

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then u can find 2 from the definition of a regular polygon

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(it can be inscribed inside a circle)

bright frost
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dm me if you need more help

worn scroll
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this length is AC - something

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pythagoras cannot be used straight away

bright frost
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you can derive the actual needed equation witht he given info

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if BC is 1425

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but wait one more important thing you can only use pythagoras is 2 values are given

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i guess you cant use it here as only 1425 is given, mb

bright frost
mellow merlin
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are angles still inscribed if theyre like this

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or this

sudden solstice
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Can anybody help me understand this?

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Idk if I got any of these answers correctly

dark sparrow
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,rccw

somber coyoteBOT
dark sparrow
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wow that is a LOT of angles they're asking you

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An.| Correct?
---+---------
 7 | Yes
 8 | Yes
10 | No
11 | Yes
14 | Yes
15 | Yes
16 | Yes
17 | Yes
18 | Yes
19 | Yes
20 | Yes
21 | Yes
22 | No
24 | No
25 | Yes
29 | Yes
32 | Yes
35 | Yes
36 | Yes
37 | Yes
41 | No
44 | Yes
45 | Yes
#

@sudden solstice

icy sigil
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I wish I had this

solid needle
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shoutouts and kudos to ann for actually taking the time to list those out

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goddamn

trail tendon
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ig

mellow merlin
dark sparrow
bleak blade
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NO NO NO

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I REMEMBER THIS

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no

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i remember it being hard

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no

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i saw some friends doing it

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and decided not to do it

maiden brook
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just use calc

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it gets messy but it isn’t that bad

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I have seen this question before yeah

spark plover
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im struggling to remember how identities interact with one another

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i understnad now why quoitent identity worked for this

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but at the time i could not see it is there like any way for me to be able to recognize these i dentites better?

silent plank
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-cot(t) wasn't distributed properly
and none of those options seem appropriate for the last part

spark plover
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making things more complicated then it should be

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(I really shouldve taken in person classes for this)

silent plank
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wait, misread the expression

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i suppose its technically ok, misread cot for cos
but for the last one, it should be a combination of quotient and double identity

silent plank
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quotient identity by itself would only lead you to
= -cot(t) + 2sin(t)cos(t)
which isn't quite the final result

spark plover
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but wait

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oh wait nvm

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continue

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no wait

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yeah wait a minute

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thats the exact reason why i got confused on why quoitent idenity would work for this

silent plank
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don't worry about their options
and first focus on what you'd normally do

spark plover
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i see now

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but everytime i try to solve it at the time i cant see the options

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i have trouble trying ot piece what the next step should be to get it to the result I want

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like just a bit before

dreamy geode
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I don't get the 5 and I have an answer to 4 but I don't think it's right..

obsidian harness
atomic thicket
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Since angle of depression is 5°

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The angle of elevation would be 85°

atomic thicket
silent plank
#

no

atomic thicket
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Why not

silent plank
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by definition / alternate angles on parallel lines

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angles of depression and elevation are congruent

atomic thicket
silent plank
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they'll be the same size

atomic thicket
silent plank
#

yes

atomic thicket
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Well

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Oh yeah

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Sorry dude

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Lol

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I always mistake angle of depression as the third angle

dreamy geode
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I saw these solutions on yt I'm not sure which is true or am I even doing it right

signal vapor
#

???

south garden
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how do i solve this

obtuse quiver
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Anybody know (b)

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I got 22

obsidian harness
ionic cairn
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i forgot how to do these and would like some help if possible

obsidian harness
#

by angles in parallel lines, angle QRP = angle STP
angle RQP = angle TSP as well

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hence you have angle-angle similarity, between triangles QRP and STP

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can you now set up an equation about the side lengths ratios of both triangles?

dreamy geode
obsidian harness
#

try drawing the setup out

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you should then have the opposite side to the 5 deg angle = 26 m
and the adjacent side to the 5 deg angle you don't know, so we'll call that x

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and yes, tan theta = opposite/adjacent is the right trig ratio to use

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if you change 80 to 85, one of the methods you wrote is indeed correct

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you need to think through this yourself and figure out how to get to the correct answer, not just what the answer is

dreamy geode
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Oh

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It is supposed to be 85 sorry

obsidian harness
ionic cairn
obsidian harness
ionic cairn
#

eh?

obsidian harness
#

QS and SP correspond to RT and TP

tiny halo
#

sorry to bother but could anyone help to check some of my answers for a trigonometry worksheet (6 questions, the absolute basics)

obsidian harness
#

!help

lime crownBOT
#

To ask for mathematics help on this server, please open your own help channel or help thread. See #❓how-to-get-help for instructions.

obsidian harness
#

and you can ask your question directly

obsidian harness
ionic cairn
#

ty

obsidian harness
ionic cairn
#

have a blessed day mate

obtuse quiver
#

but the thing is when there’s |a|=|b|=1 given

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Aren’t we supposed to use that only if the vector is in terms of only a and b and not both

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That’s just what I wanna understand

sudden solstice
#

Guys I need help my teacher told me to do this and I don’t know how 😭

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And I think I got some answers wrong

sudden solstice
#

Like that long message he posted

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@solid needle

silent plank
#

yes/no answers to which ones are correct

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also refer to Ann as she

sudden solstice
silent plank
#

*she posted, not he

sudden solstice
#

Oops

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Like how do I find them out is what I am aksibg

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Asking*

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Not to just give me the answers

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And tell which ones are wrong

silent plank
#

your initial request implied you wanted to know which ones you got correct
assuming you used valid methods to obtain those, that cuts the list of stuff you need assistance on

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57 is a lot to go through one by one

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state specific ones you want to focus on

south garden
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Deepseek, I gave it the question but I didn't understand the solution

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It's C

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Here's a better picture

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Sorry for the poor quality pictures, my phones front camera is broken

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Yes

honest idol
#

This is my type of channel.

south garden
#

So a and b's values ?

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I have to hop off rq, you can ping me the explanation if you solve it

thin hearth
#

Apparently they’re teaching us probabilities in geometry now (I’m not sure if they’re supposed to)

I’m not sure how to calculate number four where it says “Tara has 10 pennies, 4 nickels and 6 dimes in her purse. If she were to grab two coins, P(total of at least 15 cents)?”

My teacher told me to make a table to solve it but I really got stumped there

regal wedge
#

the table i’m guessing is doing the same thing but drawn out

dreamy geode
# dreamy geode

May somebody help me know how to do the 5th one?
I was confused on how to do the figure and most probably solving it..

zealous pike
#

Can't one of the sides be given by solving for:

4x + 2y = 400
xy = 400?

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sully it is giving me an imperfect square which is making me think that it is a wrong approach

south garden
#

Yeah

sudden solstice
#

Help me understand this

dark sparrow
#

,rccw

somber coyoteBOT
dark sparrow
#

@sudden solstice have you made any changes on this since i wrote down that table detailing what you got right and wrong?

zealous pike
sudden solstice
dark sparrow
#

apply various properties of angles formed by intersecting lines, or by angles formed when two parallel lines are intersected by a third.

sudden solstice
#

I still don’t understand

zealous pike
#

I'd try finding the right angles first

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That question can be solved through the notions of property of angles alone

vocal charm
pale girder
sand marlin
#

have yall ever tried heroin

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its fun

gentle haven
#

Pretty cool but really impractical for what I used it for

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But it works

trail tendon
gentle haven
#

For what I used it for

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It was not very good

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But yeah it can help in other cases

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I don't remember exactly but I remember it involved trig and could be solved a lot quicker with b*h/2

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Ohh ok

somber coyoteBOT
#

Vanellope von Schmugz

upper karma
#

I need help rearranging sectors

south garden
#

I haven't gotten the opportunity but I doubt they'll test us on something like that today

topaz shore
#

how about

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chat gpt solves it for us 😏

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geometry did not teach me that 🙏🙏

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seems like just simplifying it

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foil 🗿

topaz shore
#

make sure to use inspection method on ur exam if theres any systems 👍🏻

somber coyoteBOT
#

Vanellope von Schmugz

topaz shore
#

foil left to

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erm

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😭

#

dawg

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honors algebra 2 w/ trig

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is my level

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THAT

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is not

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i know what all the funny little triangle side formulas are

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no idea what doa is

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ok now i know

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mensa brain has absorbed it

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im evolving

rapid rampart
#

Just came back after missing a whole chapter used ai ngl.. I need to know not sure on any of these

rapid rampart
#

Alright I ended up redoing some of my answers

rapid rampart
#

I think I’m goood now

signal vapor
#

How do we prove the identity cos(x+y) = cosxcoy-sinxsiny without the unit circle?

dark sparrow
#

@signal vapor

sudden solstice
sudden solstice
radiant anchor
#

so like the given radius is 4cm and the central angle is 45 degress what is the area of the sector

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i was wondering if my answer is correct 0.62cm squared

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cuz the formula given to me by my teacher was the area of the sector - area of the triangle

silent plank
#

did you mean you wanted area of the segment?

meager glacier
#

I might be trash, but trig proofs have been kicking my ass lmao

meager glacier
#

I think I got them, one i didnt even know how to approach because i wasnt taught the difference of cubes formula

#

im a lil nervous on skipping precalc so im investing hours into trig

somber coyoteBOT
#

Vanellope von Schmugz

meager glacier
#

i do have a bit of a question on an identity
SinXCosY
And
CosXSinY
Are two different identities which seems weird to me because you can move around multiplication due to the commutative property of multiplication

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product to sum ID

south garden
#

yeah ?

#

oh yeah I wrote my trig test today

meager glacier
#

I guess its just a context thing

south garden
#

I don't wanna 😫 . I wrote my last math test for the term today

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and I'm writing physics tomorrow so I gotta lock in for that

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yeah

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It was a pretty easy test

somber coyoteBOT
#

Vanellope von Schmugz

meager glacier
#

so glad i dont have to memorize all these, im close to laminating my unit circle sheet with all my IDs written on them

somber coyoteBOT
#

Vanellope von Schmugz

meager glacier
#

I was so relieved to find out most engineering courses allow you to have formula sheets

#

yeah i need to look up what the functions mean physically, im visual learner so SEEING cosine (as being just a plotted value of your x coordinate) on the unit circle was super helpful
Wonder if i can do the same with the identities

remote wyvern
#

hello guys is some of you all had problems with math and how you solves them? cause I don't know why but don't matter how hard I try I'm still not good(especially with geometry...)

livid plaza
civic pond
#

dawg i suck at matrix 😿

#

just watched like 2 videos i dont get it much

livid plaza
civic pond
#

im so slow at it tho

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i did

livid plaza
#

well, atleast you can do it

civic pond
#

the formula is confusing

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its so weird

livid plaza
#

PrACtIce mAkeS A mAn PerFEcT

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I don't know about matrix

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I just started 10th so..

civic pond
#

i dont need this in life ugh

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same im in year 10 as well

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i gotta give igcse tests in april im gonna die

livid plaza
#

I mean 10th class

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in school

civic pond
#

me too dawggg

signal vapor
livid plaza
#

matrix in 10th? That's weird

civic pond
#

yehh its different education systems ig

civic pond
#

its so hard omg

signal vapor
#

Oh

#

Best of luck

civic pond
#

thank uuu 💙

livid plaza
#

When I search matrix in google, I get the movie lol

civic pond
#

search matrix math lol

signal vapor
#

There are no formulas in that

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Determinants ??

livid plaza
civic pond
#

there was

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like for adding them

#

u gotta criss cross it

signal vapor
#

Oh

civic pond
#

so weird

signal vapor
#

I remember watching a 3blue1brown video

#

It is really good

civic pond
#

ohhh this channel is nice

#

ill def watch some vids later

livid plaza
#

pls share the channel

civic pond
#
livid plaza
#

oh ok

livid plaza
livid plaza
sudden solstice
#

Explain this to me pls

sudden solstice
#

Please explain how I get the answers and not just tell me which ones I got wrong

hollow lichen
#

Uhhhh

dusty loom
#

Wut du hell

livid plaza
neat wigeon
#

it's not that hard

#

just a lot

neat wigeon
chilly glacier
trail tendon
chilly glacier
#

16, 31, 35, 20 all are 45°

#

37 n 34 too

trail tendon
#

you're just giving the answers away 😔

chilly glacier
chilly glacier
#

bruh u need to learn these angles and properties

vocal charm
chilly glacier
#

uhm... sorry... I didn't mean to..🙂

vocal charm
#

Like it’s quite apparent

chilly glacier
#

sorry dude...

scarlet osprey
#

Wait

#

Is this the wrong channel to send doubts?

#

I deleted it, I just read the rules my bad
I got confused by 'occupied'

trail tendon
#

afaik

scarlet osprey
#

Oh I see

idle goblet
#

i have this demonstration
I have an isosceles triangle ∆ABC
CH is the height relative to AB
I have to trace the projection of H to AC and the projection of H to CB

the projection to AC is P
to CB its Q
if i project Q into AB (Q') and P into AB (P')
by construction it means that P'H = Q'H right?

idle goblet
#

oh
im the worst in class and the BEST one in class told me that im wrong

#

fucker

vague token
#

If yes, that's it

idle goblet
#

ah

#

what did i get wrong

idle goblet
#

noo i got ghost pinged

#

😭

bleak blade
#

ofc theyre equal

#

idk what the so called best one in class is saying

idle goblet
#

my dude said 'how do u prove that' like twice
then said 'believe what u wanna believe'

#

bro..

plain marten
#

anyone knows how to do this?
its about the area of an arch with given angle and radius

wet pond
#

Anybody doing silly triangles

fast junco
#

Guys,can we use the menelaus theorem for any case(provided we choose the components correctly)?

idle goblet
#

its symmetry,
theres nothing to believe

H is the median of AB , and is also a point of the height, CH,
since the rectangle is ∆ABC isosceles (given by the book) projecting H into the two long sides, AC and BC, (thus forming a 90° angle) will have the same length for both (since H is median of AB)
and if i project the two projections on the base (AB) where H is located in, (lets call them P and Q) we get P' and Q' that by symmetry are equidistant from H, thus making them congruent

#

its not to prove

#

its by construction

#

if you want to school me on this

#

tell me at least why im wrong

#

oh wait

#

youre acting like

#

AAAA

#

sorry its not even 7 am im not thinking

#

sorryyy

#

im just going off what i wrote yesterday

#

lol

#

happens often to me too

vague token
tough reef
# livid plaza translate.

I don't know spanish but from the words here and there, it feels like they gave the radius and angle of each sector and asked the areas

vague token
visual elk
#

Bruh how we supposed to understand when its Spanish explain pls.

dark sparrow
#

i would imagine that these:

R = 2
tan(EF) = 4/3
FB * BC = 3 sqrt(2)
calcule ("calculate") BG
are self explanatory

obsidian harness
#

I don't actually know Portuguese but I can figure it out from my knowledge of Spanish

#

"no gráfico a seguir" = "on the | graphic | to | follow" ~ on the following diagram
"se" means if and "e" means and

#

also Portuguese does have "diagrama" if that helps in any way

#

||sine rule on the triangle formed by AE and AFB gives BF = 4/sqrt(5)||
||so I can now find AF and BC of course, what's next?||

#

||AG/BG = BG/BC so I know if we find AG we're good||

#

there's just so many damn computations

obsidian harness
#

sure

#

I feel I'm going about this the wrong way due to it being inefficient

#

angle EOF is (EAF)/2 then there's a formula for sin(arctan(x)/2)

#

cause I have all this technology I just used WA or equivalent, but by hand it's sin^2 x = (1 - cos 2x) / 2 and now sub x = u/2 and square root both sides

so sin u = sqrt((1 - cos(u) / 2) = sqrt((1 - 3/5) / 2)

#

yeah I mean I knew the solution had to be a lot more elegant

#

ah wait that's a brilliant observation

so you can let opp = sqrt(5), hyp = 5, and hence adj = sqrt(20) = 2 sqrt(5)
so tan theta is indeed 1/2

#

I did not notice that yeah

#

yeah I figured out that the line was collinear but I didn't know how to use it

upper karma
#

Does anyone have spare exercises relating to this lesson? This topic in our school usually entails finding the measures of the sides and angles. I have exams tomorrow and I would appreciate some exercise resources. Thank you!

obsidian harness
#

there are formulas for $A \circ B$ and $B \circ A$ where $A$ = regular trig functions and $B$ = inverse trig functions

somber coyoteBOT
plush surge
#

someone gave me this in a work as a challange. I have no clue how to calculate the side X. Basically, the length of the square is 100 meters and the width is 50 meters, the surface of the curved section down is 2500m↑2 and the length of the leg of the right triangle is 25 meters and I need to calculate the hypotenuse X. Annoying is the curve, there is no informations to the curve

#

please help someone derg_sad

#

This is the original paper

lapis moon
#

This type of questions is textbook exercise on the Co-side Theorem (共邊定理, a.k.a. Dovetail Theorem (燕尾定理))
https://baike.baidu.com/item/燕尾定理/10828082

merry vessel
#

hey does anyone know if it's possible to solve this, btw diagram isnt drawn to scale

cunning lion
#

what are you trying to solve for?

covert ermine
#

Can someone tutor me?

brave dirge
#

Everytime I ask ChatGPT to calculate cos(2x), it never can on the first try, lol. Anyone else notice that?

brave dirge
lime dune
#

well that should be a strong sign to

#

not use GPT?

#

!nogpt

lime crownBOT
#

Please do not trust ChatGPT or similar AI tools for mathematical tasks, as they often generate output which "sounds correct" but has numerous factual or logical errors. Use of these AI tools to answer other people's help questions is strictly against server rules (see #rules).

brave dirge
lime dune
#

don’t

#

they legitimately have no idea what they’re doing

brave dirge
#

Deepseek doesn't have the same issue, I thought it was interesting, lol

brave dirge
lime dune
#

you just said gpt couldn’t do it consistently

#

if that isn’t a red flag idk what is

brave dirge
#

The others were fine

lime dune
#

and let me ask you

#

is that a sign of a well designed calculator/assistant?

#

of course not

brave dirge
lime dune
#

it cannot actually do math, all it’s doing is pattern recognition “hmm what word should go next?”

lime dune
brave dirge
lime dune
#

why have so many grade school students so blindly embraced gpt usage 😭

brave dirge
#

Assuming the textbook is correct, then the AI would be as well

#

I'm not arguing that it is reliable at any depth or complexity, but for fairly standard Trig exercises (like calculating double angles), AI seems proficient

lime dune
#

why is your first instinct to use a “tool” as unreliable at gpt

brave dirge
#

Thats probably the equivalent of asking it to calculate the integral of 1/x^2 from 2 to 5, lol. I'm willing to bet it will return the correct value

lime dune
#

is it really too much effort to just look up the double angle formula and then plug it into wolfram or smth

brave dirge
maiden brook
#

like it has potentially the right approach for this but messes up badly

fervent pine
#

how can i prep for honors geometry next year

upper karma
#

how old ru guys

trail tendon
primal flare
#

omg pls help 💔

upper karma
#

can someone explain to me how hyperbolas work

#

I don't get how to find the constant and the x,y values

inland tangle
somber coyoteBOT
primal flare
#

i swear thats all i need 🥀

inland tangle
#

you know AF = radius F circle and BC = radius C circle right?

primal flare
#

OMG

#

ITS 7+17

#

OMG

#

YOU SAVED MY LIFE

#

THANK YOU SO MUCH

solid needle
#

if you're going to check your work, use something that we know is reliable

#

even if chatgpt is reliable at certain depths (which im still not convinced it is), at what point does it start to become unreliable?

#

why not just use something that is reliable

#

"hey im gonna use this tool that has a 2% chance of cutting my finger instead of this tool that has a 0% chance"

#

why

#

this generation smh

brave dirge
#

I've mostly just taught myself Math all this time actually and none of my classmates ever recommended it to me before

#

But I just checked it out and I love what I'm seeing, definitely going to being using this while doing math from now on

solid needle
#

are you referring to wolframalpha

#

because if so, good

brave dirge
#

Its reallyyyy good

solid needle
#

ive been using this thing since i was in high school

#

its insane that this thing exists and students are still using chatgpt

#

like actually mad

brave dirge
#

I know!

#

I feel the same after seeing it 💀

solid needle
#

good, tell your friends

brave dirge
#

Sadly, I don't have any math friends, lmao

#

No one in my life would gaf 😂

#

Its a lonely road

solid needle
#

or just mention it when it comes up

#

whenever its relevant

brave dirge
#

How reliable do you consider ChatGPT or Deepseek to be in explaining math concepts?

sinful shoal
#

yo guys can someone tell what square root of squareof ....-1 is?

dark sparrow
#

when you say ``square root of square of $-1$'', do you mean $\sqrt{(-1)^2}$? bc this is $\sqrt{1}$, or just $1$.

somber coyoteBOT
trail tendon
dense pilot
#

Hi, this is all correct right?

#

Was a bit confused about the placement of the square

obsidian harness
#

*correct

livid plaza
obsidian harness
#

you just would write $\sin 3^2 = \sin 9$ btw

somber coyoteBOT
high vault
#

what's the best way of expressing angles? radians or degrees?

#

also how on earth do i memorize the unit circle

dark sparrow
dark sparrow
silent plank
#

depends on what you're doing/whom you're communicating with

#

memorise the first quadrant, you can get the rest through reflections

dark sparrow
#

silly mnemonic for the first quadrant

obsidian harness
dark sparrow
#

funky how

#

it's literally mine

obsidian harness
obsidian harness
#

I had a friend with tiny hands like yours

silent plank
#

Diagram not drawn to scale

dark sparrow
#

where are you getting that i have small hands

obsidian harness
#

the watch? idk

dark sparrow
#

there's no scale reference in the pic is there

obsidian harness
#

the proportion just doesn't look right on your hand idk

dark sparrow
crystal oar
#

guys can someone teach me circular measure, im about to have a mental breakdown

dark sparrow
#
  1. what do you mean by "circular measure"?
  2. are you able to calm yourself down enough to not be on the brink of mental breakdown?
clear sedge
#

guys, who can help with stereometry?

left plover
#

Is khan academy trigonometry good if you forgot everything

worn scroll
#

then just imagining unit circle cos is the x length and it is longer with smaller angles

obsidian harness
#

also org chem tutor has better videos than Khan

obsidian harness
#

hard to measure objectively, sure

#

but omg Sal Khan talks at a snail's pace

#

if I watch org chem tutor I know I'll see 2 fleshed out examples or more in 10 minutes and I'll actually be learning new stuff each minute

#

like 2x speed is not a permanent solution for a bad video

#

same I can't judge

#

I was really turned away due to a few bad impressions

#

fuck this is really shit compared to org chem tutor

#

I'm not saying he's the best, but like there's so much better out there

#

they're still using 10 year old videos? after so much funding??

#

omg

#

that's goated

#

yeah mmm at what point is that just tutoring then hmm

#

like connecting different topics with each other is really nice tho

#

and making corollaries as you said

#

damn, send me a link to the site

#

wow

#

do you think that Spanish speakers would want to use it

#

if it's really that good

#

just turn on auto-generated subs to understand the videos

#

so much maths online

#

oh yeah science but you don't need to do experiments to know stuff, haha

#

nah thanks for the offer

#

but Aus is a lovely enough country for me

half zenith
#

anyone can help with the answer (want to check against someone else's)

hidden marsh
#

can any tell me what eccentric means

solid needle
#

there is a technical definition for the eccentricity of a conic section

#

but we are going to skip that for now

#

but basically it is a value that describes the shape of the conic section

#

for circles its 0

#

ellipses are between 0 and 1, where the more flat it is, the closer to 1 it is

#

if your eccentricity is 1 or higher, you'll get other shapes like hyperbolas or parabolas

#

for ellipses in particular, the eccentricity is e=c/a

#

c is distance from focus to center, a is semimajor axis

#

this definition can extend much further to generalize to all conics but you can go look that up if you want

sharp viper
#

I'm starting to learn about optics, and I saw Newton's equation for a curved mirror f^2 = x_o x_i where x denotes the horizontal distance to the focus. I recognize that for a point on the principal axis, this means its image is the circular inverse of itself with respect to the circle with diameter spanning from the center of curvature to the mirror vertex.
Is there a simple geometric proof for this fact?
Is there a similar geometric relation for points not on the principal axis (maybe for simplicity, we consider the paraxial approximation)?

woeful shell
#

circle

upper karma
#

Who can help me

open flame
#

send the question I might be able to

#

Though I wasn't great at geometry

latent gull
#

@upper karma What you need help with?

upper karma
#

its a lot of questions

#

I cant find an AI to help me with it

#

Is this correct

latent gull
#

give me a sec... let me look into it

open flame
#

oh it's just that

#

no it's wrong

upper karma
#

Damn

open flame
#

hypotenuse is in front of the 90 degree angle

#

imagine a line going forward from the 90 degree square mark

#

it's the diaganol line

latent gull
#

LN NM = leg

open flame
#

yeah

latent gull
#

LM = Hypot

open flame
#

no LN is the altitude

#

not a leg

upper karma
open flame
#

the mean is just taking the average

#

it would be D

frosty lintel
#

geometric mean is different

#

nah

#

geometric mean is not average

open flame
#

oh it wouldn't?

frosty lintel
#

thats arithmetic mean

#

its stupid

#

geometric mean is like

#

u add rhe numbers up

#

and take the root

#

like

#

ok if u have

#

3 4 and 5

#

u go

#

cube root of 3+4+5

#

not add im dumb

#

multiply

#

cube root of 345

open flame
#

oh it's root n of all the number mulitplied together

frosty lintel
#

if u have 3 4 5 and 6

#

u go fourth root of 345*6

open flame
#

is there latexer here

upper karma
open flame
#

,,\sqrt[n]{a * b * c... etc}

frosty lintel
upper karma
#

and it wasn’t D 💔

somber coyoteBOT
open flame
#

that's the best way I can explain it

#

your problem would be

#

,,\sqrt[2]{2 * 8}

somber coyoteBOT
open flame
#

do you get it?

wet pond
rapid valley
#

Geometric mean is a triangle that has an altitude if I remember correctly

polar solstice
#

What’s the answer to this?

wet pond
lime crownBOT
wet pond
#

given the options you should be able to determine the answer

pliant monolith
#

How do i solve this?

bleak blade
pliant monolith
#

I tried it but had to use L'Hospital too many times

bleak blade
#

Hmm

pliant monolith
#

is there any other easy way to do it?

bleak blade
#

I dont thunk so

#

Also wrong channel

pliant monolith
#

ah sorry

somber coyoteBOT
#

Vanellope von Schmugz

rapid valley
neat kelp
obsidian harness
spark plover
#

im lowkey struggling cause I forgot something

#

im in the middle of doing trig equations and i forgot how to turn

#

,,\2sqrt{3}/2

#

ill figure it out at some point

#

this

#

into these

#

i forgot how to convert from secant to something that would be in sin,cos, or tan

#

to get my radians

dark sparrow
#

sec(t) = 1/cos(t)

spark plover
#

yeah but i think the way i was doing it was wrong

#

since i switched the numerator and denominator around

dark sparrow
#

show your work

spark plover
dark sparrow
#

2 sqrt(3) * 2 sqrt(3) isn't 4

#

and also you went about this rationalization in a way that i can only describe as laborious

spark plover
#

thats a one

#

mb

dark sparrow
#

2 sqrt(3) * 2 sqrt(3) isn't 1 either

spark plover
#

i figured

#

i just didnt know what to do

dark sparrow
#

you overthought it and forgot how arithmetic with radicals works

spark plover
#

yeah ive been going at it all day

#

i think my brain is done for today

spark plover
#

i have the material from pearson and have been using that

#

and sometimes i do that

dark sparrow
#

you are tired

spark plover
#

yeah i see it now

#

loooorrrrrdddddddddd

#

1

#

its supposed to be 1

spark plover
#

i see too many issues now

#

my brain is catching up to why this screwed me up

dark sparrow
spark plover
#

thank you so much

#

i think what messed me up was the 2*sqrt(3) being together

#

and then like you said i began overthiking

#

im gonna go to sleep now and make sure i dont do that again 😭

sharp viper
#

Alternatively tangent difference identity works with m1 = 2, m2 = 1/3

obsidian harness
obsidian harness
obsidian harness
#

,w sqrt((2 - 1.2)^2 + (2 - 0.4)^2)

obsidian harness
#

your coordinates of E are wrong: they should be (1.2, 0.4)

#

I think you know the idea but that minor error changes everything

obsidian harness
#

oh I see I didn't know you took the origin to not be at the bottom left

#

that makes sense, I just assumed haha

#

IDK anymore

obsidian harness
#

Oh right yes it is 45 degrees

#

Don't know how you got there but yep

outer reef
#

<@&268886789983436800>

spark yacht
#

I want to prove that angle D = 90-1/2A

#

lines bisect angle a b and c

#

nvm im done

granite marsh
#

aah

#

i just saw the question

#

any other question?

#

anyone

spark yacht
#

@granite marsh

#

this one is easy

granite marsh
#

it will use pythagoras theorem

#

butw what's AO2?

spark yacht
#

with diagram btw 😏

granite marsh
#

I just want to ask that AO2 is included in the equation ar not

granite marsh
obsidian harness
spark yacht
#

I mean why would it be

granite marsh
#

done

#

just doing it in systematic way

spark yacht
granite marsh
#

yes

#

the photo with diagram is 1st page

#

@spark yacht ☝️

spark yacht
#

yes

granite marsh
#

is it clear enough?

#

?

#

should I explain anythying ? @spark yacht

#

??????

spark yacht
granite marsh
#

We just used pythagoras theorem

#

in triangle AOM and BOM to get AM^2 = BM^2

#

then we again used Phythagoras theorem in triangle AON to get AN^2

#

then I found a relation between AM and AN with the information given:- AB=2AC

#

then equated equation 1 and 3

#

and got the answer

#

simple

spark yacht
#

hm nice

sudden solstice
#

I am cooked guys I got a 40 on my test in geometry

granite marsh
#

out of?

spark yacht
sudden solstice
#

40%

granite marsh
#

oh

sudden solstice
#

We doing this thing hold on let me find picture of it

spark yacht
#

out of 100

sudden solstice
#

I got this wrong and ik I did lol cause when I put it into ai now it says this is answer

#

I am cooked

granite marsh
#

Are TS and VW parallel?

sudden solstice
obsidian harness
granite marsh
obsidian harness
#

easy for you lol

#

easy for us but not htem

sudden solstice
#

Yea

spark yacht
#

yea

#

but good luck for next test

#

i want a 100 from u

sudden solstice
#

I was using 1% of my brain

spark yacht
#

how do I improve my observation

#

in circles

#

I can grasp whats going on in other shapes like triangles and quadrilaterals

sudden solstice
#

Yea my brother is in the same class as me and he told me when he got a 57% “I am gonna run up the hallways naked” and in front of our teacher

granite marsh
sudden solstice
#

Ayo

spark yacht
sudden solstice
#

Oh

spark yacht
#

But I ignored it idk why

#

can someone drop some algebra on algebra

little oriole
# spark yacht how do I improve my observation
  1. Understand the Basics Thoroughly
    Before you can observe patterns, ensure you have a solid grasp of foundational math concepts. The better you understand the core principles, the more easily you'll spot important details or trends in problems.
  2. Look for Patterns
    Geometric Shapes: In geometry, observe how different shapes relate to each other, how angles change, or how symmetry plays a role.
    Algebra: In algebra, notice how certain variables behave. Look for patterns in equations or factorization.
    Functions: Observe how a function behaves, especially when graphed. Does it have symmetry? Are there any periodic patterns?
  3. Work with Visuals
    Draw Diagrams: Especially in geometry or calculus, sketching out problems can help you see things more clearly. Visualizing math can help in spotting key relationships between elements.
    Graphs: Plotting equations and looking at them visually often reveals trends, slopes, or asymptotes that might be hard to spot algebraically.
  4. Practice Mental Math
    Training your brain to quickly recognize patterns in numbers or equations helps improve your ability to spot errors, shortcuts, or important relationships when solving problems.
  5. Examine Problems from Multiple Angles
    Break it down: In word problems or equations, try different methods to approach them. Sometimes a geometric approach works better than an algebraic one, or vice versa.
    Try Simplifying: Simplify complex expressions or equations and see if any patterns emerge. For example, factoring quadratics or simplifying radicals might give you new insights.
spark yacht
#

yeah I didnt see the arc

little oriole
#
  1. Study Solutions Carefully
    When solving problems, take time to understand the steps involved. If you made a mistake, try to figure out where your observation went wrong.
    Review examples and try to reverse-engineer the solution. This will help you notice strategies or techniques that can be applied to similar problems.
  2. Look for Symmetry or Invariance
    In mathematics, many problems have symmetrical or invariant properties. Whether it’s symmetry in algebraic expressions, geometric shapes, or number patterns, recognizing these can help simplify your work.
  3. Play with Problem Variations
    Try solving slightly altered versions of the same problem. For example, change the numbers in an equation or modify the geometry of a shape. This will train you to observe how small changes affect outcomes.
  4. Use Problem-Solving Strategies
    Apply various problem-solving strategies such as working backward, making substitutions, or breaking problems into smaller parts to notice how the structure of a problem evolves.
  5. Practice Regularly
    Like any skill, mathematical observation improves with practice. Consistent exposure to different types of problems helps sharpen your observational and problem-solving skills.
spark yacht
#

chat gpt ahh answer

granite marsh
little oriole
sudden solstice
spark yacht
little oriole
#

i dont have nitro so had to copy half way

#

lawl

#

chat gpt tf evn is that tbh ?

spark yacht
#

some cool

#

like fe

spark yacht
#

!nogpt

lime crownBOT
#

Please do not trust ChatGPT or similar AI tools for mathematical tasks, as they often generate output which "sounds correct" but has numerous factual or logical errors. Use of these AI tools to answer other people's help questions is strictly against server rules (see #rules).

spark yacht
#

what was it

little oriole
#

what is it....lawl ?

spark yacht
#

If they said

#

other lines were altitudes

#

I couldve bashed orthic triangle

sudden solstice
#

I study with it I don’t use it as answer cause my teacher is smart ☠️

spark yacht
#

I struggle with geometry

sudden solstice
spark yacht
#

what

spark yacht
sudden solstice
#

Fr

sudden solstice
spark yacht
#

😂

sudden solstice
#

.

spark yacht
#

how old are u bud

granite marsh
#

.

sudden solstice
#

Erm

#

.

spark yacht
#

bro

#

u finna get banned

granite marsh
#

should we report?

sudden solstice
#

On god

spark yacht
#

<@&268886789983436800>

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this is for your own safety bro

sudden solstice
spark yacht
#

minimum age for discord is 13

granite marsh
#

bro discord has age restriction

little oriole
#

lawl

granite marsh
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come when u r 13

little oriole
#

dude just gave up

spark yacht
#

lol

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u got any

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fe

granite marsh
#

?

little oriole
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fe ?

spark yacht
#

oh he was in grade 6th

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how would he have fe

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functional equations

granite marsh
#

what is ur grade?

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12th?

spark yacht
little oriole
#

dayum bro...............creating ur own short terms

granite marsh
#

gud