Vocab Group 7: Circles

Front

Circle

Back

A round plane figure whose boundary consists of points equidistant from a fixed center point.

Front

Center

Back

The fixed point from which all points on a circle are equidistant.

Front

Radius

Back

A line segment from the center of the circle to any point on its circumference.

Front

Diameter

Back

A line segment that passes through the center of the circle and has its endpoints on the circle.

Front

Chord

Back

A line segment whose endpoints lie on the circle.

Front

Arc measure

Back

The measure in degrees of an arc's central angle.

Front

Arc

Back

A portion of the circumference of a circle.

Front

Arc length

Back

The distance along the arc between two points on the circle.

Front

Minor arc

Back

An arc that is smaller than a semicircle.

Front

Major arc

Back

An arc that is larger than a semicircle.