1.

ABisa verticalpolewithB atthegroundleveland Aat thetop. Amanfindsthatthe angleof elevationof thepointA froma certainpointC onthegroundis 60^@. Hemovesaway fromthe polealongthe lineBCto a pointD suchthatCD = 7 m. fromD theangleof elevationof thepointA is45then theheightof thepoleis

Answer»

`(7sqrt(3))/(2)(1)/(sqrt(3) +1)m`
`(7sqrt(3))/(2)(1)/(sqrt(3) -1)m`
`(7sqrt(3))/(2) (sqrt(3) +1)m`
`(7 sqrt(3))/(2) ( sqrt(3)-1) m`

Answer :C


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