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If two tangents inclined at an angle of $60^\circ$ are drawn to a circle of radius $5$ cm from an external point, then the length of each tangent is equal to :
- (a)$\frac{5\sqrt{3}}{2}$ cm
- (b)$10$ cm
- (c)$\frac{5}{\sqrt{3}}$ cm
- (d)$5\sqrt{3}$ cm
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Ans. (d) $5\sqrt{3}$ cm