document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=445502>Question 445502</A>: <I><SPAN STYLE=\"word-break: break-all;\">  <BR>\n" );
document.write( "The formula for the area of circle is A= pi.r^2   .(page 395# 28)<BR>\n" );
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document.write( "Find the inverse of the funtion  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #306868 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=306868\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A= pi.r^2<BR>\n" );
document.write( "this is equivalent to:<BR>\n" );
document.write( "f(r) = pi*r^2<BR>\n" );
document.write( "y = pi*r^2<BR>\n" );
document.write( "switch y's and r's:<BR>\n" );
document.write( "r = pi*y^2<BR>\n" );
document.write( "solve for y:<BR>\n" );
document.write( "r = pi*y^2<BR>\n" );
document.write( "r/pi = y^2<BR>\n" );
document.write( "sqrt(r/pi) = y<BR>\n" );
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document.write( "therefore, the inverse is:<BR>\n" );
document.write( "sqrt(A/pi)<BR>\n" );
document.write( "so, if you knew the area (A), you can find the radius (r)<BR>\n" );
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