Circumference, Radius, and Diameter

What is the diameter?

• 8

• 16

• 10

• 4

Is the red line a radius or diameter of the circle?

• Radius

• Diameter

What is the diameter?

• 8

• 16

• 10

• 4

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

What is the circumference?

• 36

• 18pi

• 108pi

• 36pi

Find the circumference of the circle. Use 3.14 for π.

• 63.585 in²

• 28.26 in

• 14.13 in

• 4.5 in

Since we have diameter, what is the appropriate formula to use?

• C = π x d

• C = 2 x π x r

• Secant
• Diameter
• Radius
• Chord

If OC is 7 cm, AB is ______.

• 3.5 cm

• 7 cm

• 14 cm

• 28 cm

If OC is 7 cm, AO is ______.

• 3.5 cm

• 7 cm

• 14 cm

• 28 cm