The student will be able to give angle measures in degrees and radians and locate coterminal and reference angles.

- Drag the red point to change the angle on the graph.
- The
*alpha*angle is in "Standard Position." Notice that one ray of the angle stays in the same place. Where is the other ray when the angle is 0 degrees? 90°? 180°? 270°? 360°? - Now notice the relationship between the
*alpha*angle and the*theta*angle. The*theta*angle is called the "Reference Angle."

Activity (Paper Plates) (PDF)

**Clark U:** Online notes on degree and radian measures. Clark U**Interactive Math:** Online notes on degree and radian measures.Interactive Math

- Click the button for an Online Puzzle