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PQ and PR are tangents to the circle of radius $3\text{ cm}$ and centre O. If length of each tangent is $4\text{ cm}$, then perimeter of $\Delta OQP$ is :
- (a)$5\text{ cm}$
- (b)$12\text{ cm}$
- (c)$9\text{ cm}$
- (d)$8\text{ cm}$
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(b) $12\text{ cm}$