Definition: Arc length is the length of the piece of circle with radius r cut by central angle α.

Interactivity: Arc Length - Circle Directions for Interactivity

Directions: In the interactivity, click and drag the sliders for radius and angle α.
  • Notice that the arc length is always the radius multiplied by the angle α (measured in radians).
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  • To convert from degrees to radians, multiply by: π/180°   (the degree symbols will cancel)
  • To convert from radians to degrees, multiply by: 180°/π   (the degree symbol remains)

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Page last modified on June 19, 2011, at 04:47 AM