1.

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 ?

Answer»

`AF^(2)+BD^(2)+CE^(2)=AE^(2)+CD^(2)+BF^(2)`
`AB^(2)+BC^(2)=AC^(2)`
`AF^(2)+BD^(2)+CE^(2)=OA^(2)+OB^(2)+OC^(2)`
`AF^(2)+BD^(2)+CE^(2)=OD^(2)+OE^(2)+OF^(2)`

Answer :A


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