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Interactive rolling epicycloids

Author:
Malin Christersson
An interactive version of the rolling epicycloids described by John Baez (and others) at: http://johncarlosbaez.wordpress.com/2013/12/03/rolling-hypocycloids/ In order to fit inside each other, each epicycloid rotates around a point that lies on the periphery of a circle whose midpoint is the centre of the next (larger) epicycloid.

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