Original creation of this applet goes to Jennifer Silverman and subsequent changes by Tim Brzezinski (derived from this worksheet.)
Interact with this applet for a few minutes, then answer the question that follows.

Is there any relationship among the arc length, the angle (in degrees) at the centre, and the radius of the circle? Can you see any pattern for the ratio of angle at centre over total angle (360 deg), and the ratio of arc length over the circumference?