Orthogonal Projection of a Solid of Constant Width

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 .


  • [Snapshot]
  • [Snapshot]
  • [Snapshot]


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

Embed Interactive Demonstration New!

Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site. More details »

Files require Wolfram CDF Player or Mathematica.