document.write( "Question 456416: A six inch diameter copper pipe water riser fifty feet tall is full of water and needs to be drained down how many gallons will be drained \n" ); document.write( "
Algebra.Com's Answer #313276 by rfer(16322)\"\" \"About 
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V=pi*r^2*h
\n" ); document.write( "V=3.14*0.0625*50
\n" ); document.write( "V=9.8125 cu ft
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\n" ); document.write( "9.8125*7.48=73.40 gallons
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