Wittenbauer's Parallelogram

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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.


Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA




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