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A $30$ m long rope is tightly stretched and tied from the top of pole to the ground. If the rope makes an angle of $60^\circ$ with the ground, the height of the pole is :
- (a)$10\sqrt{3}$ m
- (b)$30\sqrt{3}$ m
- (c)$15$ m
- (d)$15\sqrt{3}$ m
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(d) $15 \sqrt{3}$ m