document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1129384>Question 1129384</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The area of a circle is 3 1/7 times the square of the radius.  Find weight of a circular disc of cast iron 7 ft. in diameter and 1 1/3 in. thickness.  \r<BR>\n" );
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document.write( "A plate of cast iron 1 ft. square and 1 in. thickness weighs 37.5 lbs. \r<BR>\n" );
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document.write( "Attempt:\r<BR>\n" );
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document.write( "The disc is a cylinder.\r<BR>\n" );
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document.write( "Volume; pi * r*2 * height.  3.1416 * 3.5 * 3.5 * .1108333 = 4.265375 cu. ft.\r<BR>\n" );
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document.write( "Not sure how to continue.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #745974 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39620)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=745974\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> That given <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3%261%2F7 ALIGN=MIDDLE  ALT=\"3%261%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" > is an approximation for <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=pi ALIGN=MIDDLE  ALT=\"pi\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "Find weight of a circular disc of cast iron 7 ft. in diameter and 1 1/3 in. thickness. <BR>\n" );
document.write( "A plate of cast iron 1 ft. square and 1 in. thickness weighs 37.5 lbs. <BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=pi%2Across%28%287%2F2%29%5E2%29%2A%281%261%2F3%29 ALIGN=MIDDLE  ALT=\"pi%2Across%28%287%2F2%29%5E2%29%2A%281%261%2F3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, cubic inches, the circular cast iron disc<BR>\n" );
document.write( "No..  Not 7 inches diameter; but \"7 feet diameter\".\r<BR>\n" );
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document.write( "All the rest of this was wrong:<BR>\n" );
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document.write( "The described PLATE of cast iron, density:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2837.5%2Apounds%29%2F%2812%2Ainches%2A12%2Ainches%2A1%2Ainch%29 ALIGN=MIDDLE  ALT=\"%2837.5%2Apounds%29%2F%2812%2Ainches%2A12%2Ainches%2A1%2Ainch%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2837.5%2F144%29%28pounds%2Fcubicinch%29 ALIGN=MIDDLE  ALT=\"%2837.5%2F144%29%28pounds%2Fcubicinch%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "The weight of the circular cast iron disc:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28pi%2A%287%2F2%29%5E2%2A%281%261%2F3%29%2837.5%2F144%29%2Apounds%29 ALIGN=MIDDLE  ALT=\"%28pi%2A%287%2F2%29%5E2%2A%281%261%2F3%29%2837.5%2F144%29%2Apounds%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "You can compute the expression how you want. </SPAN>\n" );
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