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The angle of elevation of the top of a t...

The angle of elevation of the top of a tower at a point on level ground is `45^(@).` When moved 20 m towards the tower, the angle of elevation becomes `60^(@). `What is the height of the tower ?

A

`10 (sqrt3 -1) m`

B

`10 (sqrt3 +1) m`

C

`10 ( 3 - sqrt3) m`

D

`10 (3 + sqrt3) m`

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