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From a point on the ground the angle of ...

From a point on the ground the angle of elevation of the bottom and top of a transmission tower fixed at the top of a 20m. High building are `45^(@)and60^(@)` respectively. What is the height of the tower?

A

`20sqrt(3)m`

B

`20(sqrt(3)-1)m`

C

`14.64m`

D

`14.94m`

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