document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=818352>Question 818352</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the diameter of the circle that has a circumference equal to its area. \r<BR>\n" );
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document.write( "  2\r<BR>\n" );
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document.write( "  4\r<BR>\n" );
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document.write( "  8\r<BR>\n" );
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document.write( "  10 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #492486 by </B><A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><B>TimothyLamb(4379)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=TimothyLamb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=492486\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a = pi*r*r = r*pi*r<BR>\n" );
document.write( "c = 2*pi*r<BR>\n" );
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document.write( "first method:<BR>\n" );
document.write( "for a to equal c the value of r would have to be 2:<BR>\n" );
document.write( "a = r*pi*r = 2*pi*r = c<BR>\n" );
document.write( "a = 2*pi*2 = 2*pi*2 = c<BR>\n" );
document.write( "r = 2<BR>\n" );
document.write( "---<BR>\n" );
document.write( "second method:<BR>\n" );
document.write( "a = pi(rr)<BR>\n" );
document.write( "c = 2pi(r)<BR>\n" );
document.write( "pi(rr) = 2pi(r)<BR>\n" );
document.write( "pi(rr)/pi = 2pi(r)/pi<BR>\n" );
document.write( "rr = 2r<BR>\n" );
document.write( "rr/r = 2r/r<BR>\n" );
document.write( "r = 2<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Solve and graph linear equations:<BR>\n" );
document.write( "https://sooeet.com/math/linear-equation-solver.php<BR>\n" );
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document.write( "Solve quadratic equations, quadratic formula:<BR>\n" );
document.write( "https://sooeet.com/math/quadratic-formula-solver.php<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Convert fractions, decimals, and percents:<BR>\n" );
document.write( "https://sooeet.com/math/fraction-decimal-percent.php<BR>\n" );
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document.write( "Calculate and graph the linear regression of any data set:<BR>\n" );
document.write( "https://sooeet.com/math/linear-regression.php </SPAN>\n" );
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