What is ptolmey\’s theorem
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For a cyclic quadrilateral, the sum of the products of the two pairs of opposite sides equals the product of the diagonalsAB×CD+BC×DA=AC×BD.This fact can be used to derive the trigonometry addition formulas. Ptolemy\’s theorem states the relationship between the diagonals and the sides of a cyclic quadrilateral. It is a powerful tool to apply to problems about inscribed quadrilaterals.