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[" 17.A tower stands at the centre of a ...

[" 17.A tower stands at the centre of a circular park.A and "B" are two points on the boundary of the park "],[" such that "AB(=" 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 "],[[" (A) "(2a)/(sqrt(3))," (B) "2a sqrt(3)," (C) "(a)/(sqrt(3))," (D) "a sqrt(3)]]

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