# Orthogonal Projection of a Solid of Constant Width

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This Demonstration illustrates Minkowski's theorem: the orthogonal projection of a solid of constant width is a figure of constant width. The solid is a Meissner tetrahedron (consisting of 13 parts); it is projected ontoa plane through the origin with normal .

Contributed by: Izidor Hafner (January 2015)

Open content licensed under CC BY-NC-SA

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Reference

[1] M. Gardner, *The Unexpected Hanging and Other Mathematical Diversions*, New York: Simon and Schuster, 1969 p. 219.

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