Circumference of a Circle

What is the radius of this circle?

• 18

• 10

• 9

• 8

Determine the radius of the penny

• 59.66 mm

• 9.5 mm

• 38 mm

• 119.32 mm

What formula is this used for:
πd

• Area

• Circumference 

• Surface Area

• Volume 

What is the circumference?

• 36

• 18π

• 108π

• 36π

What formula is used to find the distance around a circle?

• Area

• Surface area

• Circumference

• Volume

Other than the formula C=πd what is another formula for circumference of a circle?

• C=2π

• C=2πr

• C=πr²

• C=πd²

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

• r = 1/2d

• d = 2r

• C = πd

• A = πr²

What is the radius?

• 18

• 72

• 38

• 14

What is the circumference?

• 48

• 96

• 24

• 18

Diameter 13.5 in
Find the circumference of the circle.

• 84.79 in

• 42.39 in

• 21.195 in

• 572.265 in