Understanding the Volume of Spheres and Hemispheres

What is a sphere?

• A three-dimensional rectangle

• A two-dimensional shape with no volume

• A set of all points in space equidistant from a center point

• A flat circle

Which formula represents the volume of a sphere?

• V = 2πr²

• V = 4/3πr³

• V = πr²h

• V = 1/3πr²h

If the diameter of a sphere is 22 cm, what is the radius?

• 44 cm

• 22 cm

• 11 cm

• 5.5 cm

How do you round 5,572.45 to the nearest tenth?

• 5,572

• 5,572.4

• 5,572.5

• 5,573

A volleyball has a diameter of 10 inches. What is its radius?

• 20 inches

• 15 inches

• 10 inches

• 5 inches

If a snowball melts at a rate of 1.8 cm³ per minute, how long will it take to melt a snowball with a volume of 113.4 cm³?

• 62.9 minutes

• 65 minutes

• 63 minutes

• 60 minutes

What is a hemisphere?

• Half of a sphere

• A quarter of a sphere

• A full sphere

• A flat circle

How do you calculate the volume of a hemisphere?

• Use the sphere volume formula and divide by 2

• Use the cylinder volume formula

• Use the cone volume formula

• Use the sphere volume formula and multiply by 2

If the radius of a hemisphere is 9 cm, what is the volume of the full sphere?

• 1,526 cm³

• 729 cm³

• 3,052 cm³

• 2,000 cm³

What is the volume of a hemisphere with a radius of 1 cm?

• 3 cm³

• 1 cm³

• 2.1 cm³

• 4.2 cm³