document.write( "Question 629592: what is the radius of the circle defined by the equation x^2+y^2-4x+18y+81=0 ? \n" ); document.write( "

Algebra.Com's Answer #396391 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi,
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document.write( "x^2+y^2-4x+18y+81=0
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document.write( "(x-2)^2 + (y+9)^2 - 4 - 81 +81 = 0
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document.write( "   r = 2 \n" );
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