Circle Vocab Intro

An arc with endpoints on the diameter & measures 180°

• Minor

• Major

• Circumference

• Semicircle

_________________ circles - Coplanar circles that have the same center

• Tangent

• Central

• Concentric

• Common

The distance between endpoints of an arc measured in linear units

• Point of Tangency

• Arc

• Chord

• Arc Length

_________________ tangent - A line, ray , or segment that is tangent to two circles in the same plane

• Major

• Minor

• Common

• Adjacent

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

• circumference

• Circle

• semi circle

• 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

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

• radius

• minor arc

• diameter

• secant line

The distance around the circle.

• congruent circles

• semicircle

• arc

• circumference