Circumference of a Circle

What is the formula for the perimeter of a circle? Select all that apply.

• 2 π r

• π d

• π d²

• π r²

Tags

CCSS.7.G.B.4

What does "circumference" mean?

• Space a circle takes up

• Distance around a circle

• Line from one side of a circle to another

• Line from center of circle to side

A DVD has a diameter of 15 millimeters. What is the circumference?

• c = 15π

• C = 2π15

• c = 15/π

• c = 15/2π

Tags

CCSS.7.G.B.4

What is the diameter?

• 8

• 16

• 10

• 4

Tags

CCSS.7.G.B.4

Find the circumference of a circle with a radius of 12.5 mm .

• 37.68mm

• 18.84mm

• 78.5mm

• none of the above

Tags

CCSS.7.G.B.4

What is the circumference of the circle? (Circumference = pi x diamter)

• 52.56

• 21.25

• 18.84

• 6.28

Tags

CCSS.7.G.B.4

What is the circumference of this circle?

• 37.68

• 6.28

• 21.25

• 18.84

Tags

CCSS.7.G.B.4

What is the circumference of this circle?

• 18.84

• 21.12

• 37.68

• 47.10

Tags

CCSS.7.G.B.4

Mia's bike has wheels with 14 inch diameters. What is the circumference of each wheel?

• 6.28

• 34.54

• 43.96

• 28.26

Tags

CCSS.7.G.B.4