1.

If p_(1), p_(2), p_(3) are respectively the perpendiculars from the vertices of Delta ABC to the opposite sides, then (i) 1/p_(1) + 1/p_(2) + 1/p_(3) =

Answer»

`1/r`
`1/r_(1)`
`1/r_(2)`
`1/r_(3)`

ANSWER :A


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