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Cyclic-circum quadrilateral theorem

A proof of this result is given in Some Adventures in Euclidean Geometry as well as generalizations to cyclic polygons with an even or odd number of sides. The book is available for purchase as a downloadable PDF, printed book or from iTunes for your iPhone, iPad, or iPod touch, and on your computer with iTunes.

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Updated by Michael de Villiers, 24 March 2012.