Comparing coordinates on circles.
What do you notice? What do you wonder?
1. Move point C along the circle to any position in the first quadrant only.
a. What is the relationship between C and C'?
b. How are the angles CAB and DAC' related? Write down the angle measures.
c. What is the measure of angle C'AB?
2. Move point C to a new location (still in first quadrant) and answer the questions (a-c) again.
3. Repeat step 2 for a new location of Point C.