1. 13-3 Radian Measure Today’s Objective: I can measure an angle in radians

2. x y (1, 0) (0, 1) (-1, 0) (0, -1) Measure of an angle Amount of rotation from initial side to terminal side of an angle Degrees 1 rotation = Radians: 1 radian = 1 radius along circle r r 1 radian 1 rotation = circumference 360° distance along edge of unit circle Conversion Factors Degrees ↔ Radians

3. Find the missing angle measure Degrees Radians x y (1, 0) (0, 1) (-1, 0) (0, -1) Radians on Unit Circle

4. Find the exact value of trigonometric function. x y (1, 0) (0, 1) (-1, 0) (0, -1) p.848: 6-25, 37-44