Circle Geometry Terms

Front

Radius

Back

The distance from the center of a circle to any point on its circumference.

Front

Diameter

Back

A straight line passing through the center of a circle, connecting two points on the circumference.

Front

Circumference

Back

The total distance around the circle.

Front

Center

Back

The point in the middle of the circle, equidistant from all points on the circumference.

Front

Chord

Back

A line segment with both endpoints on the circle.

Front

Arc

Back

A portion of the circumference of a circle.

Front

Minor Arc

Back

An arc that is smaller than a semicircle (less than 180°).

Front

Major Arc

Back

An arc that is larger than a semicircle (more than 180°).

Front

Sector

Back

A region of a circle bounded by two radii and their intercepted arc.

Front

Segment

Back

The area between a chord and the corresponding arc.