document.write( "Question 886226: X^2+y^2=4 find the circumference \n" ); document.write( "
Algebra.Com's Answer #535778 by nerdybill(7384)\"\" \"About 
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X^2+y^2=4 find the circumference
\n" ); document.write( ".
\n" ); document.write( "Standard form of a circle is:
\n" ); document.write( "(x-h)^2 + (h-k)^2 = r^2
\n" ); document.write( "if the center of the circle is at (0,0) we have:
\n" ); document.write( "x^2 + y^2 = r^2
\n" ); document.write( "from inspection of:
\n" ); document.write( "X^2+y^2=4
\n" ); document.write( "we know that the radius(r) is 2
\n" ); document.write( ".
\n" ); document.write( "Circumference is:
\n" ); document.write( "(pi)D
\n" ); document.write( "or
\n" ); document.write( "(pi)(2r)
\n" ); document.write( "(3.14)(2*2)
\n" ); document.write( "(3.14)(4)
\n" ); document.write( "12.56 (circumference) \n" ); document.write( "
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