A tower stands at the centre of a circular park. If \( A \) and \( ...

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A tower stands at the centre of a circular park. If \( A \) and \( B \) are two points on the boundary of the park, such that
W \( A B=a \) m subtends an angle of \( 60^{\circ} \) at the foot of the tower and the angle of elevation of the top of the tower from \( A \) or \( B \) is \( 30^{\circ} \). Find, then the height of the tower is
(a) \( \sqrt{3} \) am
(b) a/ \( \sqrt{3} m \)
(c) \( \frac{\sqrt{3}}{a} m \)
(d) None of these
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