Glencoe Math: Course 3, Volume 2
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Glencoe Math: Course 3, Volume 2 View details
3. Volume of Spheres
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Exercise 12 Page 610

Recall the formula for the volume of a hemisphere and the formula for the volume of the cylinder.

about 113.1 cubic inches

Practice makes perfect

We are given the following solid.

Note that the solid consists of a hemisphere and a cylinder. To find the volume of the solid, we need to find the volumes of the hemisphere and the cylinder. We will start with the hemisphere. Recall that the volume of a hemisphere with radius r is half the volume of a sphere with radius r. Volume of a Hemisphere [0.8em] V=1/2(4/3π r^3) ⇔ V=2/3π r^3In this case, the radius of the hemisphere is 3 inches. We can substitute the radius into the formula and calculate the volume of the hemisphere.

V=2/3Ï€ r^3
V=2/3Ï€ ( 3)^3
â–¼
Evaluate right-hand side
V=2/3Ï€(27)
V=2(27)/3Ï€
V=54/3Ï€
V=18Ï€
V=56.548667...
V≈ 56.549

The volume of the hemisphere is about 56.549 cubic inches. Next, we will find the volume of the cylinder. We will start by recalling that the volume of a cylinder with the radius r and height h can be calculated by the following formula. V=Ï€ r^2 h The given cylinder has a height of 2 inches and a radius of 3 inches. Let's substitute these values into the formula and calculate the volume of the cylinder.

V=Ï€ r^2 h
V=Ï€ ( 3)^2 ( 2)
â–¼
Simplify right-hand side
V=Ï€(9)(2)
V= π (18)
V=56.548667...
V≈ 56.549

The volume of the cylinder is about 56.549 cubic inches. Finally, we can calculate the volume of the solid by adding the volumes that we found. 56.549+56.549=113.098 ≈ 113.1 Therefore, the volume of the solid is about 113.1 cubic inches.