document.write( "Question 866672: Write the equation of the circle with center at (-6,-1) and circumference 4π.\r
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Algebra.Com's Answer #522423 by jim_thompson5910(35256)\"\" \"About 
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circumference 4π ---> C = 4*pi\r
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\n" ); document.write( "\n" ); document.write( "C = 2*pi*r\r
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\n" ); document.write( "\n" ); document.write( "4*pi = 2*pi*r\r
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\n" ); document.write( "\n" ); document.write( "4pi/2pi = r\r
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\n" ); document.write( "\n" ); document.write( "2 = r\r
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\n" ); document.write( "\n" ); document.write( "r = 2\r
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\n" ); document.write( "\n" ); document.write( "Center: (-6,-1) ---> (h,k) = (-6,-1)
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\n" ); document.write( "\n" ); document.write( "\"%28x-h%29%5E2+%2B+%28y-k%29%5E2+=+r%5E2\"\r
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\n" ); document.write( "\n" ); document.write( "\"%28x-%28-6%29%29%5E2+%2B+%28y-%28-1%29%29%5E2+=+2%5E2\"\r
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\n" ); document.write( "\n" ); document.write( "\"%28x%2B6%29%5E2+%2B+%28y%2B1%29%5E2+=+4\"\r
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\n" ); document.write( "\n" ); document.write( "is the equation of the circle
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