The Parts of a Circle

a straight line passing from side to side through the center of a body or figure, especially a circle or sphere

• Diameter

• Circumference

• Area

• Radius

a straight line from the center to the circumference of a circle or space

• Diameter

• Circumference

• Area

• Radius

Is this Radius or Diameter?

• Radius

• Diameter

Is this Radius or Diameter?

• Radius

• Diameter

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

• Radius

• Center

• Point S

• Diameter

• Chord

• Tangent Line

What do we call the red line?

• Chord

• Arc

• Diameter

• Segment

What is line AD called?

• Area

• Circumference

• Radius

• Diameter

What is the radius?

• 18

• 72

• 38

• 14

What is the diameter?

• 8

• 16

• 10

• 4

Determine the radius of the penny

• 59.66 mm

• 9.5 mm

• 38 mm

• 119.32 mm