| Term | Definition |
|---|---|
What is a reference angle? | The acute angle between the terminal side and the x-axis |
What is the reference angle in Quadrant I? | θ |
What is the reference angle in Quadrant II? | 180° − θ |
What is the reference angle in Quadrant III? | θ − 180° |
What is the reference angle in Quadrant IV? | 360° − θ |
What is the reference angle of 150°? | 30° |
What is the reference angle of 210°? | 30° |
What is the reference angle of 330°? | 30° |
What is the reference angle of 135°? | 45° |
What is the reference angle of 225°? | 45° |
What is the reference angle of 315°? | 45° |
What is the reference angle of 120°? | 60° |
What is the reference angle of 240°? | 60° |
What is the reference angle of 300°? | 60° |