To accompany Folding and Unfolding in Computational Geometry:Part III: Ch.4.1: Folding a Polygon
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In the applet below, a square is shown which represents the unfolding of a octahedron. The distance between the moveable red slider and the leftmost black vertex is equivalent to the distance between the two green vertices on the top left edge of the square.

Move the red slider between the black dots

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

Created with Cinderella
applet created by Melody Donoso