1. Unit 3 Trigonometry Review Radian Measure Special Angles Unit Circle 1

2. Radian Measure a r  Circumference of any circle a = 2  r One complete revolution of a circle is 360 o

3. Converting Degrees to Radians

4. Converting Degrees to Radians Quadrant Angles

5. Converting Degrees to Radians Special Angles

8. 8 CAST RULE + + + + + + + – – ALL ratios + – Sin + Tan + Cos + Add Coffee To Sugar

9. Unit Circle The "Unit Circle" is a circle with a radius of 1. x

10. 60 Degrees Take an equilateral triangle (all sides are equal and all angles are 60°) and split it down the middle.

11. 30 Degrees

12. For 45 degrees, x and y are equal, so y = x: 45 Degrees x 2 + x 2 = 1 2x 2 = 1

13. How to Remember?

14. Angle sin  cos  0o0o 30° 45° 60° 90 o 1 1 0 0

15. For the whole circle we need values in every quadrant, with the correct plus or minus sign as per Cartesian Coordinates: Note that cos is first and sin is second, so it goes (cos, sin):

16. Find the exact values for the following trigonometric ratios.