document.write( "Question 51571: ISBN-0618372628\r
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Algebra.Com's Answer #34444 by rchill(405)\"\" \"About 
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The circumference c of a circle is defined as \"c=PI%2Ad\" where d is the diameter. Because the diameter is twice the radius, we get \"c=PI%2A2%2A3\" which simplifies to \"c=18.85\". That means our circumference is 18.85 inches. \n" ); document.write( "
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