1.

If P_(1),P_(2),P_(3) are altitudes of DeltaABC from the vertices A,B,C and Delta is the area of triangle then,1/P_(1)^(2)+1/P_(2)^(2)+1/P_(3)^(2) =

Answer»

`a^(2)+B^(2)+C^(2)/4Delta^(2)`
`a^(2)-b^(2)-c^(2)/DELTA^(2)`
`a+b+c/Delta`
`a^(2)+b^(2)+c^(2)/Delta^(2)`

ANSWER :A


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