### Home > A2C > Chapter 8 > Lesson 8.1.4 > Problem 8-55

8-55.

What angle in the first quadrant could you reference to help you find the sine and cosine of each of the following angles?

60°

Use the eTool below to find the needed reference angles.

Click the link to the right for the full version: *8-55 HW eTool*