bounds

[scenic shoal]

idk

<@&791435371564892232> sum1 help

[austere geyser]

BASICALY

Draw a triangle and label it with the sides and abc

[twin hawk]

since area is multiplying shit

[austere geyser]

Use cosine to find an angle

[twin hawk]

obtain the upper bounds of everything

[austere geyser]

Then use that angle to find

Area

0.5absinc

Round it all to the upperbound

Acc no

[scenic shoal]

use cosine yeah

but

mark scheme uses some loewr upper bound stuff

don't get that

[austere geyser]

Round the numerators to ub and the denominator to lb

[austere geyser]

Yhyh

[scenic shoal]

wait

1.85 x 10^-5 / 1.75 x 10^-5
1.65 x 10^-5 / 1.55 x 10^-5
1.55 x 10^-5 / 1.45 x 10^-5

n then u got

[austere geyser]

Waht

[scenic shoal]

thats the upper and lower bounds

whats the formula for angle

is it b^2 + c^2 - a^2 / 2bc

or sum

[last python]

Ye

[austere geyser]

Yh

[scenic shoal]

alrr

[last python]

Then find the angle to find the area

[scenic shoal]

what do I sub in 😭🙏

[austere geyser]

So you use the ub for the numberstore

[austere geyser]

The values

[scenic shoal]

do u use ub for all of em

[austere geyser]

No

[last python]

Ña

[austere geyser]

Use lb for denominator

[scenic shoal]

no

[austere geyser]

Ña

[scenic shoal]

on the numerator

are they all ub

[austere geyser]

I SAID NO

[scenic shoal]

alrr

[austere geyser]

Oh the numerator yh

All ub

But denominator all lb

[scenic shoal]

lmao 🤣

[last python]

Ye that right

[jovial tartan]

I think u wanna use the lb for a on the numerator

Right?

[austere geyser]

No

[scenic shoal]

i was thinking that

[last python]

Ye

[jovial tartan]

To get the biggest value yes

[last python]

Forgot about that

[austere geyser]

On the numeraltr use ub

[scenic shoal]

no it's lb bc

upper - lb will giv upper bound inni

[austere geyser]

Yh for a use lb

[austere geyser]

Yhh

I wasnt looking at the formula mb

So yh do that

[scenic shoal]

lmao

some1 help me sub these values in 😂

[austere geyser]

Is this a calc question

[last python]

Wdym

[scenic shoal]

non calc

[scenic shoal]

nah cuz idk which ones to use

[austere geyser]

Thats long then

[last python]

Draw the triangle out

[jovial tartan]

Depends which angle you are choosing to find

[scenic shoal]

its a 6 marker btw

[austere geyser]

Makes sense

[last python]

And label it first then

[austere geyser]

Simplify it

[scenic shoal]

yhyh did that

[last python]

Then choose the angle ur gonna find

[scenic shoal]

holdd up

[last python]

And the side opposite will be a

And the other two will be b and c

[scenic shoal]

yhh

alr

can i send u man the mark scheme

[last python]

Then substitute the a b and c into the formula

[last python]

Calm

[last python]

But make sure the numerator is the largest it can be and the denominator the smallest

[scenic shoal]

ibr i ain got a clue wat they doing

[austere geyser]

How is this a non calc question

[last python]

Na that’s what we just did

[scenic shoal]

oh yeah mb bro

[austere geyser]

Bc they did cos-1

[scenic shoal]

its paper 2 😭

paper2 mbmb

[austere geyser]

Which u need calc for

[scenic shoal]

mans slow rn

[austere geyser]

So its easier for u then

Do it on the calculator

[scenic shoal]

icl all i dont understand is

what num do u sub in

[austere geyser]

The triangle numbers

[last python]

Sub in a b and c

Of the labelled triangle

[austere geyser]

yk where capital A is

The side opposite is a

[scenic shoal]

which one is a tho

the one opposite it ?

[austere geyser]

Yh

[last python]

Ye

[austere geyser]

and opposite B is side b

[last python]

We ain’t finding angle B

but ye

[austere geyser]

Just explaining

[scenic shoal]

ohh wait

did htey use

lower bound for angle

[austere geyser]

No ub

[scenic shoal]

nah how tho

cuz they used the lb for b and c

[austere geyser]

They didnt

[last python]

Ye only in the denominator

[austere geyser]

They used ub

For the area

[scenic shoal]

im cooked 😭🙏

[last python]

When calculating the angle, the numerator should be the largest value possible and the denominator the smallest value possible to find the upper bound

[scenic shoal]

ok so

on the numerator

it's b^2 + c^2 - a^2 right

[jovial tartan]

But it’s the other way round in this question

[scenic shoal]

ye ^^

ms didnt do that

[jovial tartan]

Because when you take the cos inverse of a smaller number it’ll be bigger

[last python]

Oh shit

My bad then

[scenic shoal]

wait so normally youd do upper / lower

but bc its like cos inverse u do the opposite

[jovial tartan]

I guess so

[scenic shoal]

it's just a predicted paper btw

might not be like that in the exam

idk

dusty q

[last python]

Ye I guess

[hardy ice]

is the answer

1.14869406147808×10^10

[scenic shoal]

no

[last python]

Cooked

[hardy ice]

what was the ans

[austere geyser]

So why didnt they use the lb of all the values

[hardy ice]

oh shit i forgot its not an isoceles

i worked out the height using pythag 💀

[last python]

Na ur finished

[scenic shoal]

if he's finished

idk what to say about myself bro

[austere geyser]

Its not right angle

[hardy ice]

yeh i can see now

😭

[scenic shoal]

stupid question

man was on full marks till this 6 mark q came

[hardy ice]

i think i can do it

[austere geyser]

What paper os this from

[scenic shoal]

some predicted 1 my teacher put on teams

[hardy ice]

im gonna retry (im cooked)

[jovial tartan]

The largest value of x corresponds to the smallest value of cos(x)

[last python]

Are we meant to know that

Good to know ig

[austere geyser]

Still confused icl

[jovial tartan]

Well I can come to that conclusion

But I didn’t immediately think of it

[last python]

That doesn’t make sense tho

[jovial tartan]

I’m actually in year 13 tho and I’m doing further maths

Been a while since I’ve been here

[austere geyser]

So what ur saying is

A greater value for cosx would give a smaller degree?

[austere geyser]

When we do cos-1

[last python]

Na that question is shit

[scenic shoal]

btw thanks every1 for ur help

[jovial tartan]

It makes sense if you look a the graph for cos(x)

[last python]

Ye but cos(50) is greater than cos(30) I don’t get it

[austere geyser]

Cos-1

The other way

[jovial tartan]

No it’s not

[scenic shoal]

nova wyd

[austere geyser]

@jovial tartan If they need the smallest value for cosx to get the greatest degree, why did they use the ub for all instead of lb

[last python]

My fault my calculator was in radians

[austere geyser]

NVM I GET IT

MBB

[last python]

Na it’s calm

Ye

[austere geyser]

This questions needs a lot of brain

[scenic shoal]

its silly

[jovial tartan]

Maybe there’s an easier method but it’s been a while since I’ve done a gcse question so idk

[austere geyser]

Its mot even abt the method

Its abt

The brain

[hardy ice]

how is that not wrong

on the 1st line there shouldnt be 2 values that are the same

[scenic shoal]

its a predicted paper frfr

[hardy ice]

thats so flawed

ms is wrong

[scenic shoal]

yhh

[austere geyser]

Its bc

Lb-ub

[scenic shoal]

its wrong 'ok'

[austere geyser]

Which js happened to be the same value

[scenic shoal]

ig

[hardy ice]

why are we doing LB/UB

that gives the lowerbound for the angle

[jovial tartan]

It gives the lower bound for cos(x)

[austere geyser]

For cosx

[jovial tartan]

Which is the upper bound for x

[austere geyser]

Is it upto 90 tho

I mean 180

[hardy ice]

what if COS(x) was the upper bound, then x would be the lower bound?

[hardy ice]

makes sense

[jovial tartan]

I guess?

If you wanted to find the smallest possible x value

[hardy ice]

if this comess in the gcse
its frankly over

[jovial tartan]

I don’t know

Like I said, it’s been a while since I did GCSEs

I didn’t actually revise for them but still managed to get a 9 in maths

Would explain why the rest of my results are so bad tho lol

[hardy ice]

hey

a 9 is a 9

😂

[midnight surge]

quadratic formula's (negative b, +/- rt b^2 - 4ac )/ 2a

[hardy ice]

cold