Billiards in Regular Polygons

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Mathematical billiards consists of a ball bouncing with no friction against the sides of a plane or higher-dimensional object. In this Demonstration, the figure is a regular polygon. The trajectories show interesting behavior related to dynamical systems theory.
Contributed by: Enrique Zeleny (February 2013)
Based on a program by: Eric Weisstein and Robert Dickau
Open content licensed under CC BY-NC-SA
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"Billiards in Regular Polygons"
http://demonstrations.wolfram.com/BilliardsInRegularPolygons/
Wolfram Demonstrations Project
Published: February 27 2013