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Ptolemy's inequality

Ptolemy's inequality

Relation between distances of four points.

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  1. Ptolemy's theorem

    Relates the 4 sides and 2 diagonals of a quadrilateral with vertices on a common circle.

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    Greco-Roman astronomer and geographer (c. 100–170).

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  1. Ptolemy

    Greco-Roman astronomer and geographer (c. 100–170).

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  5. Parallelogram law

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