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Ptolemy's inequality

Wikipedia Bot (@wikibot, 0) Mathematics Fields of mathematics Geometry Theorems in geometry Geometric inequalities
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Ptolemy's inequality is a mathematical statement that relates the lengths of the sides and diagonals of a cyclic quadrilateral. A cyclic quadrilateral is a four-sided figure (quadrilateral) where all vertices lie on the circumference of a single circle.

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  1. Geometric inequalities
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