Van Aubel's Theorem for Quadrilaterals


	Construct squares on the outside of the four sides of a quadrilateral and draw lines between the centers of the opposite squares. Then the two lines have the same length and are perpendicular.


	Contributed by: Jay Warendorff

Van Aubel's Theorem (Wolfram MathWorld)

"Van Aubel's Theorem for Quadrilaterals" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/VanAubelsTheoremForQuadrilaterals/

Contributed by: Jay Warendorff

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Plane Geometry
Polygons
High School Geometry
High School Mathematics

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Classifying Quadrilaterals
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Four Concurrent Lines in a Cyclic Quadrilateral
Perpendicular Lines Generated by a Quadrilateral
Opposite Angles of a Quadrilateral in a Circle

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