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# circle vocabulary

### terms and definition

TermDefinition
Chord A segment whose endpoints lie on a circle.
Diameter A chord that contains the center of a circle.
Secant of a circle A line that contains a chord.
Tangent to a circle A line that lies in the plane of a circle and that intersects the circle at exactly one point.
Circle the set of all point in a plane at a given distance from a given point in the plane.
Radius A segment from a point on a circle or a sphere to the center.
Congruent circles Circle with the same radius.
Concentric circles Circles that lie in the same plane that share the same center.
Inscribed Angle Angle whose vertex lies on a circle and whose sides contain chords of the circle.
Central Angle Angle whose vertex is the center of a circle and whose sides contain radii of the circle.
Circumference Distance around a circle, that is, the perimeter of a circle.
Arc Length A fraction of the circumference of a circle defined by the arc.
Arc of a Circle Two points on a circle and the continuous part of the circle between the two points.
Semicircle An arc of a circle whose endpoints are the endpoints of a diameter.
Minor Arc An arc of a circle whose length is less than the length of a semicircle of the circle
Major Arc An arc of a circle whose length is greater than the length of a semicircle of the circle.
Created by: killer12