Circumference Review

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 

what is the circumference of this circle ?

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

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

Is this a radius or diameter?

• Radius

• Diameter

What is the radius of the circle?

• 2 yd

• 4 yd

• 8 yd

• 16 yd

Is this a radius or diameter?

• Radius

• Diameter

What is the diameter of the circle?

• 10 km

• 5 km

• 20 km

• 2.5 km

What is the formula for finding the circumference of a circle?

• C = r²

• C = rd

• A = π·r²

• C = π·d

What does C represent in the formula:

C = π·d

• Pi

• Circumference

• Diameter

• Area

What does d represent in the formula:

C = π·d

• diameter

• radius

• pi

• 3.14