Intro to Circles Vocabulary

The set of all points in a plane that are equidistant from a given point.

• Circle

• Semicircle

• Diameter

• Point

The point in the middle. The point is used to name the circle.

• Center Point

• Point of Tangency

• Radius

• Diameter

A segment whose endpoints are the center and a point on the circle.

• Radius

• Circumference

• Diameter

• Chord

A chord that passes through the center of the circle.

• Diameter

• Radius

• Chord

• Secant

A segment whose endpoints are points on the circle.

• Chord

• Tangent

• Secant

• Angle

A line that passes through the circle at two or more points and continues outside the circle.

• Secant

• Tangent

• Chord

• Segment

A line that touches a circle at exactly one point.

• Tangent

• Segment

• Secant

• Chord

The distance around the circle.

• Circumference

• Area

• Circle

• Length

A part of the circumference of a circle.

• Arc

• Tangent

• Radius

• Secant

An arc whose endpoints are the circle's diameter.

• Semicircle

• Major Arc

• Minor Arc

• Circumference