# Steinhaus' Billiard Ball Loop

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A billiard path is a polygon with vertices on the faces of a polyhedron such that if two segments meet at a vertex on a face , the plane through them is perpendicular to and the angle they form is bisected by the normal to at . A billiard ball loop is a closed billiard path.

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Contributed by: Izidor Hafner (October 2013)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

Reference

[1] D. Wells, *The Penguin Dictionary of Curious and Interesting Geometry*, London: Penguin Books, 1991, pp. 13–14.

## Permanent Citation

"Steinhaus' Billiard Ball Loop"

http://demonstrations.wolfram.com/SteinhausBilliardBallLoop/

Wolfram Demonstrations Project

Published: October 15 2013