In Figure, there are two concentric circ...

In Figure, there are two concentric circles with centre `O` . `P R` and `P Q S` are tangents to the inner circle from point plying on the outer circle. If `P R=7. 5 c m` , then `P S` is equal to (a) 10cm (b) 12cm (c) 15cm (d) 18cm

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