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Proof of Ptolemy’s Theorem

Proof of Ptolemy’s Theorem

IP 3

Let \(A\), \(B\), \(C\) and \(D\) be vertices of the cyclic quadrilateral \(ABCD\). Show that \(AC \times BD = AB \times CD + BC \times AD\).

Cyclic quadrilateral ABCD

Solution:

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Answer:\(AC\cdot BD=AB\cdot CD+BC\cdot AD\).

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