document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=380529>Question 380529</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An aluminum plate is made according to the following dimensions. The outer radius is 8 inches and the inner radius is 4 inches. (See diagram below) Use &#960; = 3.14 as an approximate value. (a) How many square inches in area is the aluminum plate (the shaded region)? (b) If the cost to construct the plate is $6.50 per square inch, what is the construction cost? (Area = &#8719; r2 ). </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #270107 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=270107\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The area of shaded portion = area of larger circle - area of smaller circle.<BR>\n" );
document.write( "larger circle<BR>\n" );
document.write( "radius = 8 \"<BR>\n" );
document.write( "Area = pi*8*8<BR>\n" );
document.write( "area = 64 pi<BR>\n" );
document.write( "...<BR>\n" );
document.write( "Area of inner circle = pi*4*4<BR>\n" );
document.write( "area = 16pi<BR>\n" );
document.write( "..<BR>\n" );
document.write( "difference = 64pi-16pi<BR>\n" );
document.write( "=48pi<BR>\n" );
document.write( "=48*3.14<BR>\n" );
document.write( "=150.72 in^2 is the shaded area<BR>\n" );
document.write( "..<BR>\n" );
document.write( "1 in^2 = $6.50<BR>\n" );
document.write( "150.72in^2= 150.72*6.50<BR>\n" );
document.write( "=$ 979.68 is the cost<BR>\n" );
document.write( "...<BR>\n" );
document.write( "m.ananth@hotmail.ca </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );