document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1141329>Question 1141329</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Two cylinders of equal radii have heights in the ratio of 1:3. If the total surface area of the two cylinders is 770cm2 and the shorter cylinder is 7 cm high, find the common radii?\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #761861 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=761861\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "small cylinder: radius r, height 7; total surface area <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%28pi%29r%5E2%2B2%28pi%29r%287%29 ALIGN=MIDDLE  ALT=\"2%28pi%29r%5E2%2B2%28pi%29r%287%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "large cylinder: radius r, height 3*7=21, total surface area <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%28pi%29r%5E2%2B2%28pi%29r%2821%29 ALIGN=MIDDLE  ALT=\"2%28pi%29r%5E2%2B2%28pi%29r%2821%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "The total surface area is 770:<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4%28pi%29r%5E2%2B2%28pi%29r%2828%29+=+770 ALIGN=MIDDLE  ALT=\"4%28pi%29r%5E2%2B2%28pi%29r%2828%29+=+770\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "With the \"pi\"s in that equation, the answer isn't going to be a \"nice\" number....  Use a calculator.... </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );