document.write( "Question 104128: A hemisphere of the radius 3 inches sits on top pf a cylinder of radius 3 inches. The entire solid is 12 inches tall. What is its volume of the entire solid? \n" ); document.write( "
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Since the hemisphere has height(radius) 3 inches then the height of the cylinder must be 9 inches(since you are told that the total height is 12 inches).
\n" ); document.write( "Now the formula for the volume of a cylinder is pi*(radius)^2*(height) and so the cylinder has volume 3.142*3^2*9=254.469 cubic inches.\r
\n" ); document.write( "\n" ); document.write( "Now the formula for the volume of a sphere is (4*pi*(radius)^3)/3.
\n" ); document.write( "This means that the formula for a hemisphere is a half of this.
\n" ); document.write( "And so the volume of a hemisphere is (2*pi*(radius)^3)/3.
\n" ); document.write( "So our hemisphere must have a volume of (2*3.142*(3)^3)/3 = (6.284*27)/3 = 56.556 cubic inches.\r
\n" ); document.write( "\n" ); document.write( "The total volume then is 254.469+56.556 cubic inches =311.025 cu.ins.ANS
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