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The Midpoint Quadrilateral Theorem


	The midpoints of the sides of any quadrilateral form a parallelogram. Drag any vertex of the magenta quadrilateral ABCD.


	Contributed by: Jay Warendorff

This theorem is also known as Varignon's theorem.

Midpoint (Wolfram MathWorld)

Midpoint Polygon (Wolfram MathWorld)

Varignon Parallelogram (Wolfram MathWorld)

Varignon's Theorem (Wolfram MathWorld)

"The Midpoint Quadrilateral Theorem" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/TheMidpointQuadrilateralTheorem/

Contributed by: Jay Warendorff

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