Question

Find the value of cos θ for the angle shown.
cos θ = 7/4

cos θ = squareroot33/4

cos θ = 4/7

cos θ = squareroot33/7

Answer 1

Theres an identity in trig that states:
\[\cos (360-x) = \cos x\] Keep this in mind, and lets look at your picture:

Answer 2

Basically, we found the hypotenuse using pythagorean theorem. We know that angle is 360-x because the angle x and this angle make a complete circle which is 360 degrees.

Answer 3

OMG that makes so much sense! Thank you! (I I didn't know how to approach this at 1st but I understand it now)

Answer 4

You're welcome, glad I could help