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Circles and Arc Lengths
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Terms in this set (16)
Circle
The set of all points in a plane at a given distance from a given point in a plane.
Chord
A segment whose endpoints lie on a circle.
Diameter
A chord that contains the center of a circle.
Secant
A line that contains a chord.
Tangents
A line that lies in the plane of a circle and that intersects the circle at exactly one point. (The Point of Tangency)
Radius
A segment from a point on the circle or a sphere to the center.
Concentric Circles
Circles that lie in the same plane that share the same center.
Arc
Two points on a circle and the continuous part of the circle between the points.
Central Angles
Angle whose vertex is the center of the circle and whose side contain radii of the circle Central Angles are equal to the intercepted arc.
Inscribed Angles
Angles whose vertex lies on the circle and whose sides contain chords of the circle. Inscribed Angles are equal to HALF the intercepted arc.
Circumference
Distance around a circle, that is, the perimeter of the circle.
Arc Length
A fraction of the circumference of a circle defined by the arc.
Semicircle
An arc of a circle whose endpoints are the diameter. Its measure is 180.
Minor Arc
An arc of a circle whose length is less than the length of a semicircle. Its measure is greater than 0 and less than 180. The arc can be named by its endpoints or with a third point inside.
Major Arc
An arc of a circle whose length is greater than the length of a semicircle. Its measure is greater than 180 and less than 360. The arc is named by its endpoints and a third point inside.
Sector
A region bound by two radii and the intercepted arc.
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