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A tower stands at the centre of a cir...

A tower stands at the centre of a circular park. A and B are two points on the boundary of the park such that `A B""(=""a)` subtends an angle of `60^@` at the foot of the tower, and the angle of elevation of the top of the tower from A or B is `30^@` . The height of the tower is (1) `(2a)/(sqrt(3))` (2) `2asqrt(3)` (3) `a/(sqrt(3))` (4) `asqrt(3)`

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