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

This applet is to compare the circumference, radius, and diameter of circles. Use the slider to change the size of the circle.

When you divide the circumference by the diameter, what always seems to come up?