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The angle of elevation of the top of ...

The angle of elevation of the top of a tower from a certain point is `30o` . If the observer moves 20 m towards the tower, the angle of elevation of the top of the tower increases by `15o` . The height of the tower is (a) 17.3 m (b) 21.9 m (c) 27.3 m (d) 30 m

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The correct Answer is:
`10(sqrt(3)+1)` m
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