document.write( "Question 177781: Analytic Geometry
\n" ); document.write( "Find the diameter and the area of the circle defined by x^2+y^2=64.
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Algebra.Com's Answer #132781 by Mathtut(3670)\"\" \"About 
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\"x%5E2%2By%5E2=64\"
\n" ); document.write( "we know from this equation that the circle has a radius of 8
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\n" ); document.write( "\"D=2%28pi%29r=2%28pi%298=16%28pi%29\"
\n" ); document.write( ":
\n" ); document.write( "\"a=%28pi%29r%5E2=%28pi%29%288%29%5E2=64%28pi%29\"
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