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Straight Line motion with rigid sets

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arxiv 1401.4743 v1 pith:MF2P3P65 submitted 2014-01-19 math.MG

Straight Line motion with rigid sets

classification math.MG
keywords linecirclegivenmotionplanerigidstraighttriangle
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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If one is given a rigid triangle in the plane or space, we show that the only motion possible, where each vertex of the triangle moves along a straight line, is given by a hypocycloid line drawer in the plane, and a natural extension in three-space. Each point lies on a circle which rolls around, without slipping, inside a larger circle of twice its diameter.

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