Question

Find cos,sin, and tan. (figure in comments)

Answer 1

Looking from the perspective of the angle.
cos theta = adjacent/hypotenuse
sin theta = opposite/hypotenuse use Pythagorean first for this triangle.
tan theta = opposite/adjacent

Answer 2

I know that, I need to be able to find the other side of the triangle

Answer 3

c^2=a^2+b^2