“Ptolemy's theorem”的概念、定义、翻译、参考文献-科学参考

单词	Ptolemy's theorem
释义	Ptolemy's theorem [`täl·ǝ·mēz ´thir·ǝm] ^MATHEMATICS The theorem that a necessary and sufficient condition for a convex quadrilateral to be inscribed in a circle is that the sum of the products of the two pairs of opposite sides equal the product of the diagonals.
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