Question

The line segment with endpoints (−20, 21) and (0, 0) is graphed on the standard coordinate plane and makes an angle, Θ, with respect to the x axis. What is cos Θ?

Answer 1

check the picture below.

Answer 2

-20/29

Explanation:

Using the Pythagorean Theorem, (20)2 + (21)2 = c2; c = 29. Since cosine is the adjacent side, cosΘ = −20/29