Circles Concepts

The circumference of a circle is

• The measurement from an edge of a circle to another edge.

• The measurement around the circle

• The measurement from an edge of a circle to another edge going through the center

• The measurement from the center of the circle to an edge of the circle

The amount of space contained inside of a circle is called the...

• radius

• diameter

• circumference

• area

What does the red line represent?

• Radius

• Diameter

• Pi

• Circumference

What is the formula for circumference of a circle?

• C = π r²

• C = 2 π r

• C = π d

• C = 2 π d

Match the following vocabulary term with its appropriate part of the circle.

• Secant Line

• Point V

• Semi-Circle

• Line PR

• Point of Tangency

• Major Arc

• Minor Arc

What is the relationship between the radius and diameter?

• The radius is half the diameter

• The diameter is half the radius

• The radius is equal to the circumference

• The diameter and radius are the same thing

What is pi?

• The ratio of the circumference to the diameter

• The distance around the circle

• Half the diameter

• The ratio of the radius to the diameter

If a circle is measure in centimeters, the units for its circumference would be:

• cm

• cm²

• cm³

If a circle is measure in centimeters, the units for its area would be:

• cm

• cm²

• cm³

If a wheel rotates one time, the distance it travels is equal to:

• The diameter of the wheel

• The circumference of the wheel

• The radius of the wheel

• The area of the wheel