document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=773471>Question 773471</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If the radius of a circle is decreased by 2 meters, the area of the circle is decreased by 80 pie m squared. what is the radius of the original circle? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #471587 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=471587\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> If the radius of a circle is decreased by 2 meters, the area of the circle is decreased by 80 pie m squared. what is the radius of the original circle?<BR>\n" );
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document.write( "let r=radius of original circle<BR>\n" );
document.write( "r-2=radius of circle decreased by 2 meters<BR>\n" );
document.write( "area of circle=&#960;*radius^2<BR>\n" );
document.write( "...<BR>\n" );
document.write( "&#960;r^2-&#960;(r-2)^2=80&#960;<BR>\n" );
document.write( "&#960; cancels out<BR>\n" );
document.write( "r^2-(r^2-4r+4)=80<BR>\n" );
document.write( "r^2-r^2+4r-4=80<BR>\n" );
document.write( "4r=84<BR>\n" );
document.write( "r=21<BR>\n" );
document.write( "radius of the original circle=21 meters </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );