ConceptPythagoras Theorem and Its Converse

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#### Question

From a point O in the interior of a ∆ABC, perpendicular OD, OE and OF are drawn to the sides BC, CA and AB respectively. Prove

that :

``

`(ii) AF^2 + BD^2 + CE^2 = AE^2 + CD^2 + BF^2`

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