Circle Review

What is the formula for circumference of a circle given the diameter?

• C = π r
• C = 2 π r
• C = π d
• C = 2 π d

The _____ is the distance from the center to any point on the circle.

• diameter
• radius
• π
• center

The distance across a circle through its center is called the _____.

• diameter
• radius
• π
• center

A _____ is half of a circle.

• circumference
• pi
• semicircle
•  composite figure

If you are given the diameter, how can you calculate the radius?

• Multiply the diameter by 2
• Divide the diameter by 2
• Add 2 to the diameter
• Subtract 2 from the diameter

Match the following

• Circumference

  (radius)

• Circumference

  (diameter)

• Area

• The distance from the middle the edge of a circle.

• Diameter

• Radius

• The distance from one side of the circle to the other.

• 3.11

• 3.12

• 3.14

• 3.15

When finding area of a circle, if diameter is given, we need to find radius. We can find radius by ___________ diameter by 2.

• Adding

• Subtracting

• Multiplying

• Dividing

Does this picture show the diameter or radius of a circle?

• Diameter
• Radius

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