Circumference

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

What is the formula for circumference of a circle given the diameter?

• C = pi x r
• C = pi x 2r
• C = pi x D
• C = pi x 2D

What is the formula for circumference of a circle given the radius?

• C = pi x r
• C = pi x 2r
• C = pi x D
• C = pi x 2D

What is the circumference?

• 48
• 96
• 24
• 18

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

Daniel wants to buy cookies for her friend. The radius of a cookie is 5 inches. What is the cookie’s circumference?

• 10 in
• 2.5 in
• 15.7 in
• 31.4 in 

Cynthia wants to buy a round photo frame for her brother. The radius of the photo frame is 9 cm. What is the photo frame’s diameter?

• 28.26 cm
• 56.52 cm
• 4.5 cm
• 18 cm

A circular swimming pool is 21 feet in diameter. What is the circumference of the pool?

• 10.5 ft
• 42 ft
• 65.97 ft
• 131.95 ft

What is the circumference of this circle?

• 3.14 cm 
• 37.7 cm
• 24 cm
• 68.4 cm

Find the circumference (to the nearest whole number)

• 88 in
• 44 in
• 116 square in
• None of the above