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From Karnataka Open Educational Resources
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, 22:24, 15 February 2015
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[[File:circle.png|400px]]
[[File:circle.png|400px]]
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==Interpretation of the problem==
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#In the given figure two circles touch internally.
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#OB and OF are the radii of the semicircle with center "O".
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#PC and PF are the radii of the circle with center "P".