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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 G on the ground is `30^(@)`. On walking 20 m towards the tower the angle of elevation becomes `60^(@)`. The height of the tower is equal to :

A

`(10)/sqrt3` m

B

`20sqrt3` m

C

`(20)/sqrt3` m

D

`10sqrt3` m

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The correct Answer is:
D
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