Parts of a Circle

The distance across a circle is...

• radius

• diameter

• circumference 

• area

What do you call the red line in this circle?

• Radius

• Diameter

• Chord

• Transversal

What is the formula for the circumference/perimeter of a circle?

• πr

• 2πr

• πr²

• 2πr²

What is the radius of this circle?

• 18

• 36

• 9

• 8

A line segment with one endpoint at the center of a circle and the other on the circle

• radius

• diameter

• chord

• circumference

Match the following part of the circle with its correct label.

• Point S

• Center

• Chord

• Radius

• Diameter

• Tangent Line

A circle whose radius is pi * r * r. 

• circumference

• area

• perimeter

• distance

Name the pictured part of the circle.

• Radius

• Central Angle

• Diameter

• Center

• Arc

Name the pictured part of the circle.

• Center

• Diameter

• Radius

• Arc

Name the pictured part of the circle.

• Diameter

• Sector

• Radius

• Chord

• Arc