About Ptolemy's inequality

In Euclidean geometry, Ptolemy's inequality relates the six distances determined by four points in the plane or in a higher-dimensional space. It states that, for any four points A, B, C, and D, the following inequality holds:

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Facts from Wikidata (CC0). Image by Dick Lyon (talk) via Wikimedia Commons (Public domain).

Ptolemy's inequality

inequality relating the six distances between four points on a plane

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About Ptolemy's inequality

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Facts from Wikidata (CC0). Image by Dick Lyon (talk) via Wikimedia Commons (Public domain).