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PQ and RS are common tangents of two cir...

PQ and RS are common tangents of two circles intersection at A and B. AB, when produced both sides, meet the tangents PQ and RS at x and y, respectively. If AB = 3 cm, xy = 5 cm, then PQ (in cm) will be.

A

3 cm

B

4 cm

C

5 cm

D

2 cm

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