Circles and Circum

Which expression could be used to find the approximate circumference of the quilt piece?

• 2(pi)16

• 2(pi)8

• 2(8)

• 2(4)

What is the diameter?

• 8

• 16

• 10

• 4

Which best approximates the circumference of the outer ring of this clip?

• 27cm

• 18cm

• 9cm

• 3cm

What is the radius?

• 18

• 72

• 38

• 14

What is the circumference?

• 36

• 18pi

• 108pi

• 36pi

What is the diameter?

• 6.5

• 15

• 26

• 78

A bicycle tire has a diameter of 27 inches. How far does the bike travel along the ground when the wheel rotates once? What is the circumference of this tire?

• 81

• 15.5

• 27

• 13

The distance around a circle; much like the perimeter of a rectangle.

• perimeter

• diameter

• circumference

• radius

After taking part in a competition, Yahir received a bronze medal with a radius of 2.5 inches. What is the medal's diameter?

• 2.5 in

• 5 in

• 4 in

• 4.5 in

Alex has trained his puppy, Popper, to jump through a ring. According to Alex's measurements and calculations, the ring has a diameter of 3.5 feet. What is the ring's circumference (use 3.14 for pi)?

• 11.32 ft

• 12.25 ft

• 10.99 ft

• 8.75 ft