Circles - Radius, Diameter and Circumference

What is the diameter?

• 5 in
• 10 in
• 3.14 in
• 15.84 in

Radius 6 cm
What is the diameter? 

• 36 cm
• 12 cm
• 6 cm
• 3 cm 

Diameter 32 inches
What is the radius?

• 16 inches
• 64 inches
• 96 inches
  96 inches
• 16 ft 

A DVD has a diameter of 15 millimeters. Which equation would help you determine the circumference?

• c = 15π
• C = 2π15
• c = 15 ÷ π
• c = 15 π

What formula is used to find the distance around a circle?

• Area
• Surface area
• Circumference
• Volume

Diameter 13.5 in
Find the circumference of the circle.

• 84.79 in
• 42.39 in
• 21.195 in
• 572.265 in 

Other than the formula C=πd what is another formula for circumference of a circle?

• C=2π
• C=2πr
• C=πr²
• C=πd²

what is the circumference of this circle ?

• 3.14 cm 
• 37.68 cm
• 24 cm
• 68.4 cm

Radius 4 inches
Find the circumference of the circle. 

• 25.12 in
• 12.56 in
• 50.24 in
• 200.96 in

Diameter 13.5 in
Find the circumference of the circle.

• 84.79 in
• 42.39 in
• 21.195 in
• 572.265 in