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X and Y are centres of circles of a radii 9 cm and 2 cm respectively, XY = 17 cm. Z is the centre of a circle of radius r cm which touches of above circles externally. Given that `angle XZY = 90^(@)`, the value of r is

A

9 cm/सेमी

B

8 cm/सेमी

C

13 cm/सेमी

D

6 cm/सेमी

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CHAMPION PUBLICATION-2012 TIER-II PAPER(22)-EXERCISE
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