document.write( "Question 857299: how do i figure out the surface area of half a cylinder Diameter:45 H:12 \n" ); document.write( "
Algebra.Com's Answer #516514 by rothauserc(4718)\"\" \"About 
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surface area of cylinder(SA) = 2*pi*r^2 + 2*pi*r*h
\n" ); document.write( "therefore half the SA of a cylinder is
\n" ); document.write( "SA = 1/2(2*pi*r^2 + 2*pi*r*h)
\n" ); document.write( "SA = 1/2(2*pi*(22.5)^2) + (2*pi*(22.5)*12)
\n" ); document.write( "SA = 1/2(3180.86 + 1696.46) = 2438.66
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