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The angle of elevation of the top of a vertical tower standing on a horizontal plane is observed to be 45º from a point A on the plane. Let B be the point 30 m vertically above the point A. If the angle of elevation of the top of the tower from B be 30º, then the distance (in m) of the foot of the tower from the point A is :

1. 15(1 + 3 )
2. 15(3 – 3 )
3. 15(3 + 3 )
4. 15(5 – 3 )

Correct answer: 15(3 + 3 )

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