Surface area of Round Solids

What is the formula to find the surface area of a sphere?

• 3πr^2

• πr^3

• 4πr^2

• 2πr^2

If the radius of a sphere is 5 cm, what is its surface area?

• The surface area of the sphere with a radius of 5 cm is 4(5)^2 = 4(25) = 100 cm^2

• The surface area of the sphere with a radius of 5 cm is 3π(5)^2 = 3π(25) = 75π cm^2

• The surface area of the sphere with a radius of 5 cm is 2π(5)^2 = 2π(25) = 50π cm^2

• The surface area of the sphere with a radius of 5 cm is 4π(5)^2 = 4π(25) = 100π cm^2

What is the formula to find the surface area of a cylinder?

• πr^2

• 2πrh

• 2πr^2 + 2πrh

• 3πr^2

If the radius of the base of a cylinder is 3 cm and the height is 8 cm, what is its surface area?

• The surface area of the cylinder is 96.48 cm^2.

• The surface area of the cylinder is 150.72 cm^2.

• The surface area of the cylinder is 72.36 cm^2.

• The surface area of the cylinder is 24.12 cm^2.

What is the formula to find the surface area of a cone?

• A = 2πrs

• A = 2πr^2

• A = πr^2 + πrs

• A = πr^2

If the radius of the base of a cone is 4 cm and the slant height is 7 cm, what is its surface area?

• 16π cm^2

• 28π cm^2

• 35π cm^2

• 44π cm^2

What is the formula to find the surface area of a hollow sphere?

• 4πr^2

• 3πr^2

• 2πr^2

• πr^3

If the outer radius of a hollow sphere is 6 cm and the inner radius is 4 cm, what is its surface area?

• The surface area of the hollow sphere is 96π cm^2.

• The surface area of the hollow sphere is 24π cm^2.

• The surface area of the hollow sphere is 48π cm^2.

• The surface area of the hollow sphere is 36π cm^2.

What is the formula to find the surface area of a partial sphere?

• A = 2πrh

• A = 2πr^2

• A = 4πr^2

• A = πr^2

If the radius of a partial sphere is 10 cm and the sector angle is 60°, what is its surface area?

• The surface area of the partial sphere is approximately 471.24 cm^2.

• The surface area of the partial sphere is approximately 300 cm^2.

• The surface area of the partial sphere is approximately 700 cm^2.

• The surface area of the partial sphere is approximately 100 cm^2.