Circumference Formulas: Radius and Diameter Fun for Grade 5

A circular garden has a radius of 4 meters. What is the circumference of the garden? (Use the formula C = 2πr)

• 6π meters

• 12π meters

• 8π meters

• 10π meters

If a bicycle wheel has a diameter of 26 inches, what is the circumference of the wheel? (Use the formula C = πd)

• 90.12 inches

• 78.54 inches

• 81.64 inches

• 85.00 inches

A round table has a circumference of 31.4 feet. What is the diameter of the table? (Use the formula C = πd)

• 15 feet

• 10 feet

• 12 feet

• 8 feet

A circular swimming pool has a radius of 10 feet. How far would you walk if you walked around the pool once? (Calculate the circumference)

• 62.83 feet

• 50.24 feet

• 31.42 feet

• 78.54 feet

The diameter of a pizza is 12 inches. How much crust is there around the pizza? (Find the circumference)

• 50.24 inches

• Approximately 37.68 inches

• 31.42 inches

• 24 inches

A hula hoop has a circumference of 18.84 inches. What is its radius? (Use the formula C = 2πr)

• 4 inches

• 3 inches

• 5 inches

• 2 inches

A circular track has a radius of 15 meters. How long is one lap around the track? (Calculate the circumference)

• 85.00 meters

• 75.40 meters

• 94.25 meters

• 100.50 meters

If a circular clock has a diameter of 30 cm, what is the circumference of the clock? (Use the formula C = πd)

• 60 cm

• 75.4 cm

• 100 cm

• 94.25 cm

A round pond has a circumference of 62.8 meters. What is the radius of the pond? (Use the formula C = 2πr)

• 15 meters

• 10 meters

• 20 meters

• 5 meters

A circular pizza has a radius of 8 inches. If you want to put a border around it, how long will the border be? (Calculate the circumference)

• 50.27 inches

• 40.84 inches

• 25.13 inches

• 62.83 inches