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In the adjoining fig. circles with cent...

In the adjoining fig. circles with centres X , Y touch each other at Z . A secant passing through Z meets the circles at A and B respectively. Prove that, radius X A `||` radius YB. Fill in the blanks and complete the proof.

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The correct Answer is:
MT = 9 cm , `:.` MN = 9 - 2.5 = 6.5 cm , `:. angleNSM = 90^(@)` , `:.` MS : SR = 2:1
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