Understanding Surface Area and Volume of a Hemisphere

What is the formula for the surface area of a complete sphere?

• 3πr²

• 2πr²

• πr²

• 4πr²

When calculating the surface area of a hemisphere, why do we add the area of the base?

• To simplify the calculation

• Because the base becomes an additional surface

• To ensure the hemisphere is complete

• To account for the missing volume

What is the radius of the hemisphere if the diameter is 20 feet?

• 10 feet

• 5 feet

• 20 feet

• 15 feet

What is the formula for the volume of a complete sphere?

• πr³

• 2/3πr³

• 3/4πr³

• 4/3πr³

How do you adjust the volume formula of a sphere to find the volume of a hemisphere?

• Multiply by 2

• Divide by 2

• Add the base area

• Subtract the base area