Circumference of Circles

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

• Area

• Surface area

• Circumference

• Volume

Diameter 13.5 in
Find the circumference of the circle.

• 84.79 in

• 42.39 in

• 21.195 in

• 572.265 in 

Tags

CCSS.7.G.B.4

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

• C=2π

• C=2πr

• C=πr²

• C=πd²

Tags

CCSS.7.G.B.4

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

Tags

CCSS.7.G.B.4

what is the circumference of this circle ?

• 3.14 cm 

• 37.68 cm

• 24 cm

• 68.4 cm

Tags

CCSS.7.G.B.4

Radius 4 inches
Find the circumference of the circle. 

• 25.12 in

• 12.56 in

• 50.24 in

• 200.96 in

Tags

CCSS.7.G.B.4

What is the diameter?

• 8

• 16

• 10

• 4

Tags

CCSS.7.G.B.4

What is the radius?

• 18

• 72

• 38

• 14

Tags

CCSS.7.G.B.4

What formula is this used for:
πd

• Area

• Circumference 

• Surface Area

• Volume 

Tags

CCSS.7.G.B.4

A DVD has a diameter of 15 millimeters. Which equation would help you determine the circumference?

• c = 15π

• C = 2π15

• c = 15 ÷ π

• c = 15 π

Tags

CCSS.7.G.B.4