X and Y are centres of circles of radii 9 cm and 2 cm. XY = 17 cm. Z i – InterviewSolution

1.	X and Y are centres of circles of radii 9 cm and 2 cm. XY = 17 cm. Z is the centre of a circle of radiusr cm which touches the above circles externally. Given that AZY = 90°, write an equation in r andsolve it.ICSE 1994
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