Bars of an Astroid
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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.
Contributed by: Sándor Kabai (September 2007)
Open content licensed under CC BY-NC-SA
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"Bars of an Astroid"
http://demonstrations.wolfram.com/BarsOfAnAstroid/
Wolfram Demonstrations Project
Published: September 28 2007