Circumference of Circles and Parts of Circle

The distance around the circle.

• congruent circles

• semicircle

• arc

• circumference

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

• circumference

• Circle

• semi circle

• tangent line

The line segment that has endpoints on a circle and passes through the center of the circle.

• radius

• minor arc

• diameter

• secant line

An arc of a circle whose endpoints are the endpoints of a diameter.

• semicircle

• major arc

• minor arc

• circle

A continuous part of a circle between two points on the circle.

• circle

• arc

• circumference

• tangent line

An angle whose vertex is the center and whose sides are the radii of the circle.

• radius

• arc

• central angle

• secant line

A line segment whose endpoints are on a circle.

• semicircle

• concentric circles

• chord

• sector of a circle

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

• arc

• radius

• center or a circle

• chord

A line that intersects a circle in exactly two points.

• diameter

• central angle

• arc

• secant line

A region of a circle bounded by an arc of the circle and two radii to the arc's endpoints.

• chord

• second line

• radii

• sector of a circle