You Are Designing a Dome House in the Shape of a Hemisphere

Multiple Choice

You are designing a dome house in the shape of a hemisphere with a 31 ft outside diameter. Two coats of sealer are required to cover and seal the exposed external concrete. If one gallon covers 110 ft ², how many gallons are required for the bill of materials?

A) 27 gallons
B) 54 gallons
C) 20 gallons
D) 30 gallons
E) 40 gallons