Radius, Diameter, and Circle Measurements Quiz

A circle has a radius of 5 cm. What is its diameter?

• 15 cm

• 10 cm

• 12 cm

• 8 cm

If the diameter of a pizza is 12 inches, what is its radius?

• 6 inches

• 10 inches

• 8 inches

• 4 inches

A circular garden has a radius of 10 meters. What is the diameter of the garden?

• 20 meters

• 15 meters

• 25 meters

• 30 meters

The diameter of a hula hoop is 8 feet. How long is the radius?

• 2 feet

• 4 feet

• 6 feet

• 8 inches

A round table has a radius of 3 feet. What is the area of the table? (Use the formula A = πr²)

• 3π square feet

• 9π square feet

• 6π square feet

• 12π square feet

If a wheel has a diameter of 20 inches, what is the circumference? (Use the formula C = πd)

• 78.5 inches

• 62.8 inches

• 31.4 inches

• 50.3 inches

A circular swimming pool has a radius of 7 meters. What is the diameter of the pool?

• 14 meters

• 12 meters

• 10 meters

• 16 meters

The diameter of a basketball is 29.5 cm. What is the radius?

• 15 cm

• 14 cm

• 14.75 cm

• 16 cm

A circular track has a radius of 15 meters. How far would you run if you went around the track once? (Use the formula C = 2πr)

• 94.25 meters

• 120 meters

• 75 meters

• 30 meters

If the radius of a cake is 4 inches, what is the diameter and how much frosting would you need to cover the top?

• Diameter: 6 inches, Frosting needed: 12π square inches

• Diameter: 4 inches, Frosting needed: 8π square inches

• Diameter: 8 inches, Frosting needed: 16π square inches

• Diameter: 10 inches, Frosting needed: 20π square inches