Periodic Orbit for Acute Triangles
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A billiard ball on the edge of an acute or right triangular table can be set in motion in such a way that it bounces off each of the other two edges and returns to its initial position
Contributed by: Kevin Choi (August 2012)
Open content licensed under CC BY-NC-SA
"Periodic Orbit for Acute Triangles"
Wolfram Demonstrations Project
Published: August 27 2012