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Varignon's theorem

Author:
Sundararajan
Topic:
Area, Geometry, Quadrilaterals
The midpoints of the sides of an arbitrary quadrangle form a parallelogram. If the quadrangle is convex or reentrant, i.e. not a crossing quadrangle, then the area of the parallelogram is half as big as the area of the quadrangle. http://en.wikipedia.org/wiki/Varignon%27s_theorem

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