Parts of a Circle

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

• radius

• minor arc

• diameter

• secant line

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

An arc that is larger than the semicircle.

• semicircle

• circle

• major arc

• adjacent arcs.

An arc that is smaller than a semicircle.

• radii

• minor arc

• tangent line

• central angle

Find the measure of arc RS

• 160

• 138

• 147

• 200

Name a minor arc

• AD

• ADB

• AB

• CD

Name a major arc.

• ABD

• BDA

• BCD

• DA