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AB is a vertical pole with B at th...

AB is a vertical pole with B at the ground level and A at the top . A man finds that the angle of elevation of the point A from a certain point C on the ground is `60^@` . He moves away from the pole along the line BC to a point D such that CD = 7 m . from D the angle of elevation of the point A is 45 then the height of the pole is

A

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

B

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

C

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

D

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

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