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उस वृत्त का समीकरण ज्ञात कीजिये जिसका केन्द्र (-3, 2) तथा त्रिज्या 4 इकाई है।

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वृत्त का केन्द्र (-3, 2), त्रिज्या = 4 इकाई
माना (h, k) वृत्त का केन्द्र तथा a त्रिज्या हो, तब वृत्त का समीकरण
`(x-h)^(2)+(y-k)^(2)=a^(2)`
`h=-3,k=2,a=4` रखने पर,
`(x+3)^(2)+(y-2)^(2)=(4)^(2)`
था `(x+3)^(2)+(y-2)^(2)=16.`

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