Question

Consider the right triangle given below. The length of side b to two decimal places is ____ pic attached

Answer 1

First, get angle A.
All the inner angles of a triangle add up to 180, you know two of them, therefore:
A=180-90-65
Now use the cosine function
cos(A)=b/25
You have A, solve for b and you're done.

Answer 2

i dont get the cos a=b/25

Answer 3

well b is opposite the reference angle of 65 and a is adjacent the reference angle of 65.

the hypotenuse is given...

you need to decide if its sin = opp/hyp or cos = adj/hyp thats needed.

Answer 4

cos?

Answer 5

to use cos you would need to find the angle A.... why do extra work...

you will get the same answer... but use what you have

Answer 6

so sin but i still don t understand how to solve it

Answer 7

ok so the hypotenuse is 25 , the opposite side is b and the reference angle is 65

sin (65) = b/25

just solve for b

Answer 8

22.66

Answer 9

thats correct...