Circle Unit Vocabulary

Front

A line that touches the circle without crossing it

Back

Tangent

Front

The arc is two times the angle

Back

Inscribed angles

Front

An arc of a circle that is exactly 180⁰

Back

Semicircle

Front

The set of all points that are a fixed distance from a central point

Back

Circle

Front

An arc of a circle that is greater than 180⁰

Back

Major arc

Front

A line segment whose endpoints lie on the circle

Back

Chord

Front

A line that intersects the circle at two points

Back

Secant

Front

The longest chord of a circle

Back

Diameter

Front

The distance from the center of the circle to any point on the circle

Back

Radius

Front

An angle whose vertex is at the center of the circle

Back

Central angle