Circumference of a Circle

The formula for Circumference is...

• 2πr

• πr²

• πd

• ¹/₂ Bh

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

• 131.88

• 65.94

• 207.05

• 103.53

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.

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.

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

How many​ flowers, spaced every 4 ​in., are needed to surround a circular garden with a 200​-in. ​radius?

• 1256

• 157

• 314

• 628

Wheel A has diameter 25.4 in. Wheel B has diameter 22.5 in. About how much farther will Wheel A travel in one rotation than Wheel​ B?

• 12.2

• 9.1

• 8.5

• 10.7

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