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A car is moving away from the base of a $30$ m high tower. The angle of elevation of the top of the tower from the car at an instant, when the car is $10\sqrt{3}$ m away from the base of the tower, is :
- (a)$30^\circ$
- (b)$45^\circ$
- (c)$90^\circ$
- (d)$60^\circ$
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(d) $60^\circ$ (1 Mark)