1. 5.1 Angles and Radian Measure

2. ANGLES Ray – only one endpoint Angle – formed by two rays with a common endpoint Vertex – the common endpoint of an angle’s initial and terminal sides. -Vertex @ origin -Initial side lies along positive x-axis

3. QUADRANTS When in standard position, an angle’s terminal side lies in a quadrant.

4. Quadrantal Angle Not in a quadrant. Terminal side is on either the x- or y-axis.

5. MEASURING ANGLES USING DEGREES Acute Right Obtuse Straight

6. MEASURING ANGLES IN RADIANS One radian is the measure of the central angle of a circle that intercepts an arc equal in length to the radius of the circle.

7. Ex #1: RADIAN MEASURE

8. MEASURING ANGLES IN RADIANS One radian is the measure of the central angle of a circle that intercepts an arc equal in length to the radius of the circle.

9. Plus just a little bit more !

10. Radians and Degrees

11. CONVERSION

12. Ex #2-3

13. Drawing Angles in Standard Position

15. UNIT CIRCLE

16. FINDING COTERMINAL ANGLES

17. HOMEWORK Pg. 480 #1-55 odd + pg. 476 Checkpoint #5 (you’ll need to read Example 5 in order to do the checkpoint)