Four Concurrent Lines in a Cyclic Quadrilateral

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A cyclic quadrilateral has all four of its vertices on a circle.
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Contributed by: Jay Warendorff (March 2011)
After work by: Alexander Bogomolny
Open content licensed under CC BY-NC-SA
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Details
A. Bogomolny, "Four Concurrent Lines in a Cyclic Quadrilateral," Interactive Mathematics Miscellany and Puzzles.
Permanent Citation
"Four Concurrent Lines in a Cyclic Quadrilateral"
http://demonstrations.wolfram.com/FourConcurrentLinesInACyclicQuadrilateral/
Wolfram Demonstrations Project
Published: March 7 2011