document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=763466>Question 763466</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I'm having trouble setting up the equation or even identifying the geometric formula for a couple of word problems. Here they are:\r<BR>\n" );
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document.write( "1. The diameter of a metal washer is 4 cm. The diameter of the hole is 2 cm. How many square centimeters of metal are there in 50 washers? Express the answer in terms of pie.\r<BR>\n" );
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document.write( "2. A circular pool is 34 feet in diameter and has a flagstone walk around it that is 3 feet wide. Find the area of the wall. Express the answer in terms of pie. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #464806 by </B><A HREF=/tutors/aboutme.mpl?userid=Cromlix><B>Cromlix(4381)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Cromlix><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=Cromlix><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=464806\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1) Radius of washer = 2cm.<BR>\n" );
document.write( "Area of washer = Pi*radius^2<BR>\n" );
document.write( "               = Pi * 2^2<BR>\n" );
document.write( "               = Pi * 4<BR>\n" );
document.write( "               = 12.57cm^2<BR>\n" );
document.write( "  Radius of hole = 1cm<BR>\n" );
document.write( "Area of hole = Pi*r^2<BR>\n" );
document.write( "             = Pi*1^2<BR>\n" );
document.write( "             = Pi * 1<BR>\n" );
document.write( "             = 3.14cm^2<BR>\n" );
document.write( "12.57cm^2 - 3.14cm^2 = 9.43cm^2 of metal<BR>\n" );
document.write( "50 * 9.43cm^2 = 471.5cm^2 of metal.<BR>\n" );
document.write( "............................<BR>\n" );
document.write( "............................<BR>\n" );
document.write( "2) Radius of pool + walkway = 20 feet<BR>\n" );
document.write( "Area of pool + walkway = Pi * r^2<BR>\n" );
document.write( "                       = Pi * 20^2<BR>\n" );
document.write( "                       = Pi * 400<BR>\n" );
document.write( "                       = 1256.64 feet^2<BR>\n" );
document.write( "  Radius of pool = 17 feet<BR>\n" );
document.write( "Area of pool = Pi * r^2<BR>\n" );
document.write( "             = Pi * 17^2<BR>\n" );
document.write( "             = Pi * 289<BR>\n" );
document.write( "             = 907.92 feet^2<BR>\n" );
document.write( "Area of (pool + walkway) - pool<BR>\n" );
document.write( "           1256.64 feet^2 - 907.92 feet^2<BR>\n" );
document.write( "                = 348.72 feet^2 (the area of the walk.) </SPAN>\n" );
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