Explore! Radius and Diameter
See circle C below. You can adjust the length of the radius using the slider.
1. Move point A along the circle. Does the length of the radius ever change? What does moving A do?
2. Move points B or D along the circle. Does the length of the diameter ever change? What does moving B or D do?
3. Move point C. How does this affect the circle?
4. Adjust the radius. What happens to the diameter when the radius is adjusted? How are they related?