1.

P and Q are center of two circles with radii 9 cm and 2 cm respectively, where PQ = 17 cm, R is the center of another circle of radius x cm, which touches each of the above two circles externally. If PRQ = 90 , then the value of x is

A. 7 cm
B. 8 cm
C. 4 cm
D. 6 cm
Answer» E.


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