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NOTES

A Short Proof of McDougall's Circle Theorem

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Pages 263-265 | Published online: 13 Dec 2017
 

Abstract

This note offers a short, elementary proof of a result similar to Ptolemy's theorem. Specifically, let di, j denote the distance between Pi and Pj. Let n be a positive integer and Pi, for 1 ≤ i ≤ 2n, be cyclically ordered points on a circle. If

then (1)

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