need help with trionometri | Mathematics | Page 1

limpid monolithBOT Jan 3, 2023, 4:52 PM

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tepid current Jan 3, 2023, 4:52 PM

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the question is decide the value of x

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and round off the two other value figures

flat dock Jan 3, 2023, 4:54 PM

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wait what

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is that 2,3

tepid current Jan 3, 2023, 4:54 PM

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yes

flat dock Jan 3, 2023, 4:54 PM

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is that meant to be a decimal?

tepid current Jan 3, 2023, 4:54 PM

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yes

flat dock Jan 3, 2023, 4:54 PM

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ah

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cool

tepid current Jan 3, 2023, 4:54 PM

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it is 2,3

flat dock Jan 3, 2023, 4:54 PM

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yea just not used to seeing comma for decimal

tepid current Jan 3, 2023, 4:54 PM

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oh

flat dock Jan 3, 2023, 4:55 PM

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yeah so do you recall what function we use

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well

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first figure out

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what side do we want to find out?

tepid current Jan 3, 2023, 4:55 PM

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x

flat dock Jan 3, 2023, 4:55 PM

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yes but is it

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the opposite, hypotenuse, or the adjacent

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side

tepid current Jan 3, 2023, 4:55 PM

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is this a sin?

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or cos or tan?

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ok lets say the x is hypotenuse

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no

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wait

flat dock Jan 3, 2023, 4:57 PM

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tepid current ok lets say the x is hypotenuse

no

tepid current Jan 3, 2023, 4:57 PM

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pause

flat dock Jan 3, 2023, 4:57 PM

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rotate it

tepid current Jan 3, 2023, 4:57 PM

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yes

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u start at the 90 degree right

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so the x is the adjacent

flat dock Jan 3, 2023, 4:57 PM

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good

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now what do we have?

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which side do we have

tepid current Jan 3, 2023, 4:58 PM

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we got the blank one and the 2,3 one

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the blank side is the hypotenuse?

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and the 2,3 one is the opposite

torpid needle Jan 3, 2023, 4:59 PM

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the other angle is 49

flat dock Jan 3, 2023, 4:59 PM

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nice

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so we have

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the opposite

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and we need to find adjacent

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do u recall what function that is

tepid current Jan 3, 2023, 4:59 PM

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yes

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uh

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i use SOHCAHTOA

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yes?

flat dock Jan 3, 2023, 4:59 PM

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sure

tepid current Jan 3, 2023, 4:59 PM

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so this is Cos

torpid needle Jan 3, 2023, 4:59 PM

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$\frac{2.3}{sin(41)}=\frac{x}{sin(49)}$

limber lotusBOT Jan 3, 2023, 4:59 PM

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haygiya

tepid current Jan 3, 2023, 5:00 PM

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i dont want answer i need to learn the answer

torpid needle Jan 3, 2023, 5:00 PM

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isnt that correct

flat dock Jan 3, 2023, 5:00 PM

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you dont need to use sin rule for this

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its a right angled triangle

flat dock Jan 3, 2023, 5:00 PM

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tepid current so this is Cos

no

tepid current Jan 3, 2023, 5:00 PM

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flat dock no

then it is a tan

flat dock Jan 3, 2023, 5:00 PM

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cos is adjacent over hypotenuse

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we dont have hypotenuse

tepid current Jan 3, 2023, 5:00 PM

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oh thats true

flat dock Jan 3, 2023, 5:00 PM

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and we dont want to find it

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we want to find adjacent

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tan has opposite

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and adjacent

tepid current Jan 3, 2023, 5:01 PM

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so this is a tan then

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cuz we have opposite and adjacent

flat dock Jan 3, 2023, 5:01 PM

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mhm

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now put the values

tepid current Jan 3, 2023, 5:01 PM

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so its 2,3/x

flat dock Jan 3, 2023, 5:02 PM

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tan(41) = 2.3/x yup

tepid current Jan 3, 2023, 5:02 PM

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yes

flat dock Jan 3, 2023, 5:02 PM

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just solve for x

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and rounding isnt an issue, right?

tepid current Jan 3, 2023, 5:03 PM

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yes

flat dock Jan 3, 2023, 5:03 PM

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cool

tepid current Jan 3, 2023, 5:04 PM

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wiat

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i did tan(41) and that is 0.160656699

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so its 0.160656699 = 2,3/x

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so can i do 0.160656699/2,3 = x

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?

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@flat dock

flat dock Jan 3, 2023, 5:05 PM

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usually

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you dont do the value of tan until the end

tepid current Jan 3, 2023, 5:05 PM

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oh

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so what do i do now?

flat dock Jan 3, 2023, 5:06 PM

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tan(41) = 2.3/x

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xtan(41) = 2.3

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x = 2.3/tan(41)

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then write the value to whatever rounding theyve asked

tepid current Jan 3, 2023, 5:06 PM

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so the answer then is x = 2.3/0.160656699

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?

flat dock Jan 3, 2023, 5:07 PM

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you would directly put 2.3/tan(41) in your calculator

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but yes

tepid current Jan 3, 2023, 5:07 PM

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i dont got a calculator

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i got google

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but google dosent work for this

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oh it works

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nvm

flat dock Jan 3, 2023, 5:08 PM

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could you give the exact question though?

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maybe you were supposed to round the figures before calculating x

tepid current Jan 3, 2023, 5:08 PM

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let me check

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yes

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round the 2 value figures

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if i translate the question is this

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Determine the side x, round to two significant figures

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hello?

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.solved

#need help with trionometri