1.

If AP, BQ and CR are the altitudes of acute triangleABC and 9AP+4BQ+7CR=0 Q. angleACB is equal to

Answer»

`(PI)/(4)`
`(pi)/(3)`
`cos^(-1)((1)/(3sqrt(7)))`
`cos^(-1)((1)/(sqrt(7)))`

Answer :B


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