Circle Vocabulary and Formulas

Match the following

• Arc Length

• The amount of space inside the circle.

• Area

• The amount of space inside a section of the circle.

• Area of a Sector

• The distance around a section of the circle.

• Circumference

• The distance around the circle.

• arc length

• area of a sector

• area of a segment

• arc measure

What is this called?

• Chord

• Minor arc

• Secant

• Diameter

The perimeter of a circle is called...

• circumference

• arc

• radius

• tangent

A segment/chord that runs through the center of the circle (the longest chord).

• Chord

• Diameter

• Radius

• Inscribed Angle

Which is the correct formula for the area of a circle?

• A = π r²

• A = 2π r²

• A=πd

• A=π d²

Which formulas can be used to find the circumference of a circle?

• C = π r²

• C = 2π r

• C = π d

• C = 2πd

What is the diameter?

• 8

• 16

• 10

• 4

The perimeter of a circle is usually called the...

• radius

• diameter

• circumference

• area

A segment with 2 endpoints on the circle.

• Chord

• Diameter

• Radius

• Inscribed Angle