Measure of an Inscribed Angles Theorem
Angle PCD is an inscribed angle in the circle. It intercepts arc CD. The measure of arc CD is in green.
1. Drag point P without moving C or D. How does the measure of angle CPD change? Arc CD?
2. Drag points C and D. How does the measure of P change?
3. Make an arc with a measure of 180 degrees. What is the measure of angle CPD?