Rolling Tetrahedron
To accompany Folding and Unfolding in Computational Geometry:Part III: Ch.4.1: Folding a Polygon
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In this applet, a square is shown which represents the unfolding of a tetrahedron. The distance between AM is equivalent to HL of the slider. The red dot, L can be moved to show the different foldings.

Please enable Java for an interactive construction (with Cinderella).

Created with Cinderella
applet created by Melody Donoso.