Understanding Circle Perimeter

What is the formula to calculate the perimeter of a circle?

• C = r^2

• C = 2πr or C = πd

• P = 2r

• C = 4r

If the radius of a circle is 5 cm, what is its perimeter using π?

• 15π cm

• 10π cm

• 20 cm

• 25π cm

A circular garden has a diameter of 10 m. What is its perimeter? (Take π as 3.14)

• 31.42 m

• 25.12 m

• 40.84 m

• 15.70 m

If a circle has a radius of 7 inches, what is the perimeter? (Use π = 3.14)

• 46.28 inches

• 43.96 inches

• 44.00 inches

• 40.84 inches

A bike wheel has a radius of 14 inches. What is the perimeter of the wheel?

• Approximately 50 inches

• Approximately 100 inches

• Approximately 75 inches

• Approximately 87.96 inches

If the perimeter of a circle is 31.4 m, what is its radius? (Use π = 3.14)

• 10 m

• 3 m

• 7 m

• 5 m

A circular swimming pool has a radius of 8 ft. What is the perimeter of the pool?

• 25.12 ft

• 40.84 ft

• 62.83 ft

• 50.27 ft

If a circular track has a diameter of 12 m, what is the perimeter?

• Approximately 37.7 m

• Approximately 45.0 m

• Approximately 25.1 m

• Approximately 31.4 m

A round table has a radius of 2 ft. What is the perimeter of the table?

• 15.7 ft

• 10 ft

• 12.57 ft

• 8 ft

If the perimeter of a circle is 62.8 cm, what is the diameter? (Use π = 3.14)

• 30 cm

• 25 cm

• 20 cm

• 15 cm