Wolfram Demonstrations Project
8769

Bars of an Astroid

A bar is turned one revolution in such a way that its ends stay on two perpendicular lines. If the two lines are in the same plane, the envelope of the moving bar is an astroid. Otherwise the envelope is a tetrahedral surface.

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 Sándor Kabai
"Bars of an Astroid"
 http://demonstrations.wolfram.com/BarsOfAnAstroid/
 Wolfram Demonstrations Project
 Published: September 28, 2007
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