document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1101875>Question 1101875</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Two concentric circles are drawn so that the inner circle is shaded. The shaded area is equal to the unshaded area. The radius of the outer circle is 12 cm. Find the difference in the radii of the two circles. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #716502 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39618)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=716502\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Just in all variables:\r<BR>\n" );
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document.write( "R, radius of outer, larger circle<BR>\n" );
document.write( "r, radius of inner, shaded circle\r<BR>\n" );
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document.write( "The larger circle would be TWICE the area of the shaded smaller circle.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=pi%2AR%5E2-pi%2Ar%5E2=pi%2Ar%5E2 ALIGN=MIDDLE  ALT=\"pi%2AR%5E2-pi%2Ar%5E2=pi%2Ar%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=pi%2AR%5E2=pi%2Ar%5E2%2Bpi%2Ar%5E2 ALIGN=MIDDLE  ALT=\"pi%2AR%5E2=pi%2Ar%5E2%2Bpi%2Ar%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=pi%2AR%5E2=2%2Api%2Ar%5E2 ALIGN=MIDDLE  ALT=\"pi%2AR%5E2=2%2Api%2Ar%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2r%5E2=R%5E2 ALIGN=MIDDLE  ALT=\"2r%5E2=R%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E2=%281%2F2%29R%5E2 ALIGN=MIDDLE  ALT=\"r%5E2=%281%2F2%29R%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=R%2Fsqrt%282%29 ALIGN=MIDDLE  ALT=\"r=R%2Fsqrt%282%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > or  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28r=%28sqrt%282%29%2F2%29R%29 ALIGN=MIDDLE  ALT=\"highlight%28r=%28sqrt%282%29%2F2%29R%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "You can substitute for R to finish. </SPAN>\n" );
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