# The Chordal Theorem

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Suppose two circles with centers A and B intersect at C and D. Then, AB is perpendicular to CD.

Contributed by: Jay Warendorff (March 2011)

Open content licensed under CC BY-NC-SA

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"The Chordal Theorem"

http://demonstrations.wolfram.com/TheChordalTheorem/

Wolfram Demonstrations Project

Published: March 7 2011