document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=112315>Question 112315</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An aluminum plate is made according to the following dimensions. The outer radius is 10 inches and the inner radius is 3 inches. (See diagram below) Use &#61552; = 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 $7.50 per square inch, what is the construction cost? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #81969 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley71><B>checkley71(8403)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley71><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=81969\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> IF YOU ARE SAYING THAT THERE IS A 3 IN. HOLE IN THE CENTER OF THE PLATE THEN:<BR>\n" );
document.write( "AREA=PI*R^2<BR>\n" );
document.write( "AREA=3.14*10^2<BR>\n" );
document.write( "AREA=3.14*100<BR>\n" );
document.write( "AREA=314 IN^2<BR>\n" );
document.write( "THE AREA OF THE 3 IN. HOLE:<BR>\n" );
document.write( "AREA=PI*3^3<BR>\n" );
document.write( "AREA=3.14*9<BR>\n" );
document.write( "AREA=28.26 IN^2<BR>\n" );
document.write( "SUBTRACTING FOR THE AREA OF THE HOLE WE HAVE LEFT:<BR>\n" );
document.write( "314-28.26=285.74 IN^2 IS THE AREA OF THE 10 IN. PLATE WITH A 3 IN. HOLE. <BR>\n" );
document.write( "285.74*7.50=$2,143.05 IS THE COST TO CONSTRUCT THIS PLATE. <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );