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：2025/12/06
Ptolemy's theorem
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(geometry) A theorem that states in a cyclic quadrilateral, the product of the lengths of its diagonals is equal to the sum of the products of the lengths of the two pairs of opposite sides.
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Ptolemy's theorem
In my geometry class, I used Ptolemy's theorem to compute the length of a diagonal in a cyclic quadrilateral.
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In my geometry class, I used Ptolemy's theorem to compute the length of a diagonal in a cyclic quadrilateral.
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