Question

The point (3, -4) is on the terminal side of an angle 0. What is cos 0? A. -3/5, B. 3/5, C. -3/4, D. 3/4, E. 3

Answer 1

well, notice the picture below

recall cosine is adjacent over hypotenuse

what's the hypotenuse? well, you can just use the pythagorean theorem to get "c" or hypotenuse