document.write( "Question 294520: If Jose used 4 gallons of wood sealant to cover the hemispherical ceiling of his vacation home, how many gallons of wood sealant are needed to cover the floor? \n" ); document.write( "
Algebra.Com's Answer #212351 by Alan3354(69443)\"\" \"About 
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The surface area of a sphere is 4pi*r^2.
\n" ); document.write( "A hemisphere is 2 pi*r^2
\n" ); document.write( "Assuming the floor beneath is round and the same size, it's area it pi*r^2.
\n" ); document.write( "It's 1/2 the area, so 2 gallons.
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