# The Three-Chord Lemma

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Let AB, AC, and AD be three chords on a circle such that AC bisects BAD. Then .

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Contributed by: Jay Warendorff (March 2011)

Open content licensed under CC BY-NC-SA

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"The Three-Chord Lemma"

http://demonstrations.wolfram.com/TheThreeChordLemma/

Wolfram Demonstrations Project

Published: March 7 2011