1. Quiz 1) Find a coterminal angle to 2) Find a supplement to 3) What is the arcsin(.325) in both radians and degrees?

2. Quiz 1) Find a coterminal angle to

3. Quiz 2) Find a supplement to

4. Quiz 3) What is the arcsin(.325) in both radians and degrees? 18.966º or.33 Radians

5. Reference Angles  All reference angles are acute (less than 90º) and can be positive or negative  Depending on the Quadrant the terminal side is in you find them in slightly different ways  A reference angle is measured to the nearest x axis

6. Reference Points radians Find where the angle falls and then we will find the acute angle to the nearest horizontal axis

7. 0 0 ' Reference Angles – 2 nd Quadrant For angles in the 2 nd quadrant you find the reference angle by: For degrees For radians

8. Reference Angles – 2 nd Quadrant For angles in the 3 rd quadrant you find the reference angle by: For degrees For radians 0 0 '

9. Reference Angles – 2 nd Quadrant For angles in the 4 th quadrant you find the reference angle by: For degrees For radians 0 0 '

10. Examples  Find the reference angle for an angle of 330º radians 330 is between 270 and 360 so it is in the 4 th quadrant.

11. Examples  Find the reference angle for an angle of radians This angle would fall in the 2 nd quadrant