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From a point O in the interior of a Delt...

From a point O in the interior of a `DeltaABC perpendiculars OD, OE and OF are drawn to the sides BC, CA and AB respectively, then which one of the following is true ?

A

`AF^2+BD^2+CE^2=AE^2+CD^2+BF^2`

B

`AB^2+BC^2=AC^2`

C

`AF^2+BD^2+CE^2=OA^2+OB^2+OC^2`

D

`AF^2+BD^2+CE^2=OD^2+OE^2+OF^2`

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The correct Answer is:
A
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