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From an external point P, a tangent PT has been drawn to a circle with centre at O and radius $3$ cm, intersecting its concentric circle at A and B. If AB = $8$ cm and OA = AP, the length PQ equals.
- (a)$8$ cm
- (b)$9$ cm
- (c)$10$ cm
- (d)$12$ cm
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(C) $9$ cm