Question

The Unit Circle

What is cos 180°?

a. 0
b. 1
c. -1
d. 1/2

Please select the best answer from the choices provided

Answer 1

-1

Explanation:

cos = opp/hyp

At 180º

adj = -1

hyp = 1

Cos 180 = -1/1 = -1

Answer 2

C. -1

Explanation:

I calculated it logically