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The angle of elevation of the top of an unfinished tower at a point distant 120 m from its base is 45°. If the elevation of the top at the same point is to be 60°, the tower must be raised to a height :

120 ( √3 + 1 ) m
120 ( √3 - 1 ) m
10 ( √3 + 1 )
None of these

Correct Answer: 120 ( √3 - 1 ) m

Explanation:

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