Difference between revisions of "Ptolemy's Theorem"

Latest revision as of 17:37, 9 May 2021

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-'''Ptolemy's theorem''' gives a relationship between the side lengths and the diagonals of a [[cyclic quadrilateral]]; it is the equality case of the [[Ptolemy inequality]].
+#REDIRECT[[Ptolemy's theorem]]
-=== Definition ===
-Given a cyclic quadrilateral <math>ABCD</math> with side lengths <math>{a},{b},{c},{d}</math> and diagonals <math>{e},{f}</math>:
-<math>ac+bd=ef</math>