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If the distance of a tangent to a circle from its centre is $4\text{ cm}$, then the length of diameter of the circle is :
- (a)$2\text{ cm}$
- (b)$4\text{ cm}$
- (c)$8\text{ cm}$
- (d)$16\text{ cm}$
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Answer : (C) $8\text{ cm}$