document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=150874>Question 150874</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0809223821/algebrahomeworkh>number power</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> A patio in the shape of a half circle and is 4 inches thick is being built. The radius is 12 feet.<BR>\n" );
document.write( "To the nearest cubic yard, how much concrete will be needed?<BR>\n" );
document.write( "How did they come up with 3 cubic yds of concrete?<BR>\n" );
document.write( "Could you please explain this for me, I am so lost. I am so grateful for any help.<BR>\n" );
document.write( "Thank-You </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #110781 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=110781\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A patio in the shape of a half circle and is 4 inches thick is being built. The radius is 12 feet.<BR>\n" );
document.write( "To the nearest cubic yard, how much concrete will be needed?<BR>\n" );
document.write( "How did they come up with 3 cubic yds of concrete?<BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "The half circle has a surface area of (1/2)(pi)r^2<BR>\n" );
document.write( "Your radius is 12 feet so the surface is (1/2)pi^12^2 = 226.19 sq. ft.<BR>\n" );
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document.write( "The depth of the patio is 4 incles or (1/3) ft<BR>\n" );
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document.write( "So the volume of the patio is (1/3)(226.19) = 75.4 cu. ft.<BR>\n" );
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document.write( "A cubic yard of cuncrete is 3 ft x 3 ft x 3ft = 27 cu. ft.<BR>\n" );
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document.write( "Dividing 75.4 cu. ft by 27 cu. ft you get 2.79 cu. yd of concrete.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );