Question

Do you know how to find the reference angles?

Answer 1

Reference angle:

1st quadrant (0° to 90°) : only the angle

2nd quadrant (90° to 180°) : 180° - angle

3rd quadrant (180° to 270°) : angle - 180°

4th quadrant (270° to 360°) : 360° - angle

Example:

1) 152°

This angle lies in second quadrant.

So reference angle: 180° - 152° = 28°

2) 300°

This angle lies in fourth quadrant.

So reference angle: 360° - 300° = 60°

3) 192°

This angle lies in third quadrant.

So reference angle: 192° - 180° = 12°