Ptolemy's Theorem
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- Ptolemy's Theorem Suppose we had a cyclic quadrilateral ABCDABCDABCD. As cyclic quadrilaterals are special, we want to find a nice relationship between the sides of the quadrila…
By Eric Zhang, Expii Team
- Ptolemy's Theorem In this post, we will prove the famous Ptolemy's theorem using the law of cosines. Let us restate the theorem here. Theorem (Ptolemy's theorem). In any quadril…
By Tae Hyung Kim, Alex Federspiel