Question

Use the image to answer the question.

Graph of unit circle in the first quadrant.

If the cosine of an angle θ
is 12
, what is θ
? You may assume that 0°≤θ≤180°
.

(1 point)

Answer 1

Cos θ = 1/2 (interpreting "12" as 1/2). On the unit circle this gives θ = 60° (or π/3 radians).