circumference of a circle

What is the blue colored part of this circle called?

• Circumference

• Diameter

• Radius

• Area

If you use a rope to make a circle, the length of the rope will be the ....

• Circumference

• Radius

• Diameter

If you draw line through the center of the circle, to its edges, that can be called its ...

• Radius

• Diameter

• Circumference

The red arrows in this picture shows the...

• Circumference

• Radius

• Diameter

If my radius is 10ft, what is my diameter?

• 20ft
• 5ft
• 31.4ft
• 62.8ft

What is the distance around a circle?

• Circumference
• Area
• Diameter
• Radius

If my diameter is 19 inches, what is my radius?

• 38 inches
• 9.5 inches
• 59.66 inches
• 119.32 inches

If my radius is 10ft, what is my diameter?

• 20ft
• 5ft
• 31.4ft
• 62.8ft

What is the circumference of this circle ?

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

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

• C = r²

• C = rd

• A = π·r²

• C = π·d