1.

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

Answer»

`cos^(-1)(2)/(SQRT(7))`
`(pi)/(2)`
`"cos"^(-1)((sqrt(7))/(3))`
`(pi)/(3)`

ANSWER :A


Discussion

No Comment Found

Related InterviewSolutions