Circle Vocabulary

Unbroken part of a circle consistng of two points called the endpoints and all the points between them

• Circumference

• Arc Length

• Tangent

• Arc

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

• Chord

• Diameter

• Radius

• Secant

Segment with its two endpoints on the circle

• Radius

• Chord

• Secant

• Tangent

A line that intersects the circle in two points

• Radius

• Diameter

• Tangent

• Secant

An arc that measures less than 180 degrees

• Minor Arc

• Central Angle

• Semicircle

• Major Arc

A segment passing through the center with endpoints on the circle

• Chord

• Diameter

• Radius

• Secant

Arcs with the same measure

• Adjacent Arcs

• Common Arcs

• Congruent Arcs

• Similar Arcs

Distance around the circle

• Arc length

• Arc

• Diameter

• Circumference

A line that intersects the circle at one point

• Tangent

• Point of Tangency

• Secant

• Common Tangent

Arcs of the same circle that intersect in one point

• Minor Arcs

• Congruent Arcs

• Major Arcs

• Adjacent Arcs