Cyclic Quadrilaterals, Subtriangles, and Incenters
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The incenters of the four triangles determined by the vertices of a cyclic quadrilateral taken three at a time form a rectangle.
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Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
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"Cyclic Quadrilaterals, Subtriangles, and Incenters"
http://demonstrations.wolfram.com/CyclicQuadrilateralsSubtrianglesAndIncenters/
Wolfram Demonstrations Project
Published: March 7 2011