Euclid, Book 3, Proposition 22
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Euclid's Proposition 22 from Book 3 of The Elements states that in a cyclic quadrilateral, opposite angles sum to 180°.
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Contributed by: Jon Perry (March 2011)
Open content licensed under CC BY-NC-SA
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"Euclid, Book 3, Proposition 22"
http://demonstrations.wolfram.com/EuclidBook3Proposition22/
Wolfram Demonstrations Project
Published: March 7 2011