Wolfram Demonstrations Project
7709

Wittenbauer's Parallelogram

Suppose that the sides of a (black) quadrilateral are trisected. Form a new (magenta) quadrilateral whose sides are defined by the four pairs of points of trisection on either side of the vertices of the original quadrilateral; it is always a parallelogram.
Drag the vertices of the black quadrilateral.

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PERMANENT CITATION

"Wittenbauer's Parallelogram" from the Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/WittenbauersParallelogram/
Contributed by: Jay Warendorff

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