# Van Aubel's Theorem for Quadrilaterals

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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 (March 2011)

Open content licensed under CC BY-NC-SA

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detailSectionParagraph## Permanent Citation

"Van Aubel's Theorem for Quadrilaterals"

http://demonstrations.wolfram.com/VanAubelsTheoremForQuadrilaterals/

Wolfram Demonstrations Project

Published: March 7 2011