SOLUTION: 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?

SOLUTION: 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?

Algebra.Com

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?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
The surface area of a sphere is 4pi*r^2.
A hemisphere is 2 pi*r^2
Assuming the floor beneath is round and the same size, it's area it pi*r^2.
It's 1/2 the area, so 2 gallons.

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