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The string of a flying kite is tied to a point on the ground. The length of the string between the kite and the point on the ground is $80$ m. The string makes an angle of $30^\circ$ with the ground. The height of the kite above the ground is:
- (a)$20\sqrt{3}$ m
- (b)$40$ m
- (c)$40\sqrt{3}$ m
- (d)$80\sqrt{3}$ m
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(b) $40$ m