Circumference Problems

If the problem ask you to find the distance around a circle, which formula should you use?

• r = d/2

• d = 2r

• C = πd

• A = πr²

Which formula would you use to answer: Lauren's bicycle tire has a diameter of 20 inches. How many inches is one full revolution of the wheel?

Circle A has a radius of 21 meters. What is its circumference?

• 131.88

• 65.94

• 207.05

• 103.53

The diameter of the circle is 18 m. Eugene incorrectly says that the circumference of the circle is about 113.04 m. What is the circumference of the​ circle? What mistake did Eugene ​make? Use 3.14 for π.

• Eugene used 9 instead of 18 for diameter.

• Eugene did not multiply by 3.14.

• Eugene used 36 instead of 18 for diameter.

• Eugene squared the diameter.

How much fencing is required to enclose a circular garden whose radius is 14 ​m?

• 43.96

• 87.92

• 138.03

• 276.35

Find the circumference of the circle in terms of π.

Circle Y has a radius of 22 meters and Circle Z has a radius of 27 meters. Find the circumferences of each circle. By how many meters is the circumference of Circle Z greater than the circumference of Circle​ Y?

Steven purchases a bowl. The diameter of the bowl is 14 cm. What is the circumference of the bowl?

• 28 cm

• 43.98 cm

• 87.96 cm

• 7 cm

What is the diameter of a circle with a circumference of 11.27π ​ft?

• 11.27

• 22.54

What is the diameter of a circle with a circumference of 132 ​ft?