Circle Formulas: Fun Circumference Challenges for 5th Grade

A circular garden has a radius of 4 feet. What is the circumference of the garden? (Use 3.14 for π)

• 25.12 feet

• 15.28 feet

• 30.14 feet

• 20.12 feet

A bicycle wheel has a diameter of 26 inches. How far does the bicycle travel in one complete rotation of the wheel? (Use 3.14 for π)

• 78.5 inches

• 85.3 inches

• 90 inches

• 81.64 inches

A round table has a circumference of 31.4 inches. What is the diameter of the table? (Use 3.14 for π)

• 8 inches

• 12 inches

• 15 inches

• 10 inches

A circular swimming pool has a radius of 10 meters. How much fencing is needed to go around the pool? (Use 3.14 for π)

• 62.8 meters

• 50.24 meters

• 78.5 meters

• 31.4 meters

A pizza has a diameter of 12 inches. What is the circumference of the pizza? (Use 3.14 for π)

• 31.42 inches

• 37.68 inches

• 25.12 inches

• 40.84 inches

A circular track has a circumference of 400 meters. What is the radius of the track? (Use 3.14 for π)

• 80 meters

• 100 meters

• 63.66 meters

• 50 meters

A hula hoop has a circumference of 78.5 centimeters. What is the diameter of the hula hoop? (Use 3.14 for π)

• 30 cm

• 20 cm

• 35 cm

• 25 cm

A round clock has a radius of 6 inches. How far does the minute hand travel in one hour? (Use 3.14 for π)

• 45.12 inches

• 25.76 inches

• 37.68 inches

• 30.24 inches

A circular pond has a diameter of 20 feet. How much water can be added if the pond is filled to a depth of 2 feet? (Calculate the circumference first)

• Approximately 500 cubic feet

• Approximately 628 cubic feet

• Approximately 314 cubic feet

• Approximately 785 cubic feet

A circular cake has a circumference of 62.8 centimeters. What is the radius of the cake? (Use 3.14 for π)

• 5 cm

• 15 cm

• 20 cm

• 10 cm