Circle Review

The distance around a circle is

• Circumference

• Radius

• Center

• Central Angle

The distance across the circle, through its center

• Radius

• Radii

• Circumferene

• Diameter

The distance from a circle to its center

• Chord

• Central angle

• circumference

• radius

What is the radius of this circle?

• 18 in

• 10 in

• 9 in

• 8 in

What is the diameter of this circle?

• 3.5 m

• 3 m

• 5 m

• 7 m

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

What is the formula for the area of a circle?

• A = π

• A = 2πr

• A = πr²

• A = πd

What does area mean?

• the distance around a shape
• half the distance around a shape
• the amount of space outside a shape
• the amount of space inside a shape

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 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