### Home > INT3 > Chapter 9 > Lesson 9.1.6 > Problem9-76

9-76.

What reference angle can you use to calculate the sine and cosine of each of the following angles? Refer to the Math Notes box in this lesson.

1. $330 ^ { \circ }$

$30^\circ$

1. $120 ^ { \circ }$

$60^\circ$

1. $113 ^ { \circ }$

1. $203 ^ { \circ }$

Use the eTool below to find the needed reference angles.
Click the link to the right for full version: INT3 9-76 HW eTool.