P and Q are centres of two circles with ...

P and Q are centres of two circles with radii 9 cm and 2 cm respectively, where PQ = 17 cm, R is the centre of another circle of radius x cm which touches each of the above two circles externally. If `angle PRQ = 90^(@)`, then the value of x is -

4 cm

6 cm

7 cm

8 cm

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