Question

Check all that apply. – is the reference angle for:

3
MA. T
3
B.
] c.
☐ D.
15:
3
2;}
3
19:1
3

Answer 1

A, C, D

Explanation:

You want the angles in the list that have π/3 as the reference angle.

Reference angle

The reference angle is the smallest angle between the angle's terminal side and the x-axis. The cosine and sine of the reference angle have the same magnitude of the cosine and sine of the angle in question.

The attached table shows that 7π/3, 2π/3, and 19π/3 have the same reference angle: π/3.