7. IF the radius of the base of a hemisphere which is bounded by a great circle is r, what is the area of the great circle? what is the total surface area of the hemisphere including the base? how do they compare?
8. If jose used 4 gallons of wood sealent to cover his vacation home, how many gallons of wood sealent are needed to cover the floor?
9. Assume a kickapoo wigwam is a semicylinder with a half hemishphere on each end. the diameter of the semicylinder and each of the half hemishperes is 3.6 meters. the total length is 7.6 meters. What is the volume of the wigwam and the surface ar

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Start with 7: what is the formula for the area of a circle?

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