Circles, circles, circles!

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

• Radius
• Diameter

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

• Radius
• Diameter

What is the circle's diameter?

• 5 cm

• 10 cm

• 20 cm

What is the circle's radius?

• 3 m

• 6 m

• 12 m

What is the diameter?

• 5 in
• 10 in
• 3.14 in
• 15.84 in

What is the circle's radius?

• 6 ft

• 12 ft

• 24 ft

The radius of a circle is

• The measurement from the center of a circle to an edge of the circle.
• The measurement around the circle
• The measurement from and edge of the circle to another edge through the center
• A line perpendicular to the diameter of the circle

The diameter of a circle is:

• The measurement around the circle.
• The distance from an edge of a circle to another edge.
• The distance from the center of the circle to an edge of a circle
• The distance from an edge of a circle to another edge through the center. 

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

Which of the following is the closest estimate of the circumference of the circle in cm?

• 15 cm

• 45 cm

• 30 cm

• 10 cm