geometry

In a cyclic quadrilateral show that the sum of the products of the opposite sides is equalto the productof the diagnals.
please help me

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  1. This is known as Ptolemy's Theorem

    Here is a page with the proof

    http://www.cut-the-knot.org/proofs/ptolemy.shtml

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  2. This proof may be useful, but it concerns the ratio of the diagonals, and the ratio of the sum of products of sides connected to the diagonals

    http://www.cut-the-knot.org/triangle/InscribedQuadri.shtml

    The

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  3. Looks like Reiny found you the proof you want.

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