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August 25th, 2012, 08:22 PM   #1
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find radius if a circle is inscribed in quadrilateral

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August 25th, 2012, 08:49 PM   #2
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Re: find radius if a circle is inscribed in quadrilateral

Drop a vertical radius down from O to DC, and call this point P. We see that DP = r and PC = 11 cm, and DP + PC = 25 cm, hence, r = 14 cm.
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