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Circumscribed Circle

Circle that contains vertices of an inscribed polygon

Secant Segment

A segment that contains a chord of a circle, and has exactly one endpoint outside of that circle

Secant line

Line that intersects at circle at two points

Congruent arcs

Two arcs with the same measure and are arcs of the same circle or congruent circles

Radius

Segment with an endpoint at the center of the circle and at a point on the circle.

Tangent Line

A line that intersects a circle in exactly one point, the point of tangency

Chord

A segment with endpoints that are on the circle

Central Angle

the vertex of this angle is the center of the circle

Semicircle

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

Diameter

The distance across a circle, through its center. a chord that goes through the center of the circle.

Intercepted Arc

The arc that lies in the interior of an inscribed angle and has endpoints on the angle

External Segment

The part of the secant segment that is outside the circle

Circle

The set of all points in a plane that are equidistant from a given point, the center.