Question

Find the value of the variable.
https://nnds-li.brainhoney.com/Resource/19791663,8AD/Assets/assessmentimages/geo%20part%202%20u1l7%203.jpg
@somy

Answer 1

use trigonometry
you have an angle 45 degrres and the side x which is adjacent to it and you know the length of the hypotenuse of the right angled triangle.

so which trig ratio do you use?

Answer 2

sine

Answer 3

sine, cos or tan?

Answer 4

are you familiar with SOH-CAH-TOA which helps you remember what the ratios are?

Answer 5

A = adjacent , O = oppoite side and H -= hypoenues

Answer 6

yes is it not sine

Answer 7

right

Answer 8

so what is it

Answer 9

well A = x (to be found), H = 7
so?

Answer 10

so its not tangent so it must be cosine

Answer 11

yes its cosine
if you write down the values as i did you you'll get the right ratio
A = x , H = 7 :- AH - so from SOH-CAH-TOA it must be cos

Answer 12

so we have
cos 45 = x / 7

now solve for x

Answer 13

4.97 but that isnt one of my choices

Answer 14

I made it 4.95

Answer 15

what are your choices?

Answer 16

https://nnds-li.brainhoney.com/Resource/19791663,8AD/Assets/assessmentimages/5a3.jpghttps://nnds-li.brainhoney.com/Resource/19791663,8AD/Assets/assessmentimages/5b3.jpghttps://nnds-li.brainhoney.com/Resource/19791663,8AD/Assets/assessmentimages/5d3.jpg
https://nnds-li.brainhoney.com/Resource/19791663,8AD/Assets/assessmentimages/5c2.jpg

Answer 17

I cant see anything on that link

Answer 18

you can get the value in radical form if you use the standard triangle