document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=11821>Question 11821</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I am not sure were this question belongs but I need an algebraic expression that give the area of a circle witha circumfernce c.  Here is the kicker I can't have any equal signs (=) or have diameter (d) in any part of the answer.\r<BR>\n" );
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document.write( "The only hint I have to go off of is Hint: The circumference of a circle with radius r is 2*pi*r, and its area is  pi*r^2.<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #6038 by </B><A HREF=/tutors/aboutme.mpl?userid=Earlsdon><B>Earlsdon(6294)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Earlsdon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=6038\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Ok, since you have been asked for an \"expression\", there wouldn'tbe any = signs any because \"expressions\" don't have = signs.\r<BR>\n" );
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document.write( "Let's write an expression for the area of a circle:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28pi%29r%5E2 ALIGN=MIDDLE  ALT=\"%28pi%29r%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > But you need it in terms of c, the circumference.<BR>\n" );
document.write( "  Let's write an equation for c:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c+=+2%28pi%29r ALIGN=MIDDLE  ALT=\"c+=+2%28pi%29r\"   DISABLED_style= \"max-width:90%; height:auto;\" > Now, solve this for <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r ALIGN=MIDDLE  ALT=\"r\"   DISABLED_style= \"max-width:90%; height:auto;\" >:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r+=+c%2F2%28pi%29 ALIGN=MIDDLE  ALT=\"r+=+c%2F2%28pi%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > and, after squaring, substitute this into the expression for the area:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28pi%29%28c%5E2%2F4%28pi%29%5E2%29 ALIGN=MIDDLE  ALT=\"%28pi%29%28c%5E2%2F4%28pi%29%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Now simplify:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c%5E2%2F4%28pi%29 ALIGN=MIDDLE  ALT=\"c%5E2%2F4%28pi%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > This is an expression for the area of a circle in terms of the circumference, c.\r<BR>\n" );
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