Geometry: Circles
Terms
Arc
-
Two endpoints on a circle and all of the
points on the circle between those
two
endpoints.
Center
-
The point from which all points on a
circle are equidistant.
Central Angle
-
An angle whose
vertex is the center of a
circle.
Chord
-
A segment whose endpoints are on a
circle.
Circle
-
A geometric figure composed of points that
are equidistant from a given point.
Circle Segment
-
The region within a circle bounded by a chord of that circle and the
minor arc whose endpoints are the same as those of the chord.
Circumscribed Polygon
-
A polygon whose segments are tangent
to a
circle.
Concentric Circles
-
Circles that share a center.
Diameter
-
A chord that intersects with the center of a circle.
Equidistant
-
The same distance. Objects can be equidistant from one another.
Inscribed Polygon
-
A polygon whose
vertices intersect with a circle.
Major Arc
-
An arc greater than 180 degrees.
Minor Arc
-
An arc less than 180 degrees.
Point of Tangency
-
The point of intersection between a
circle and its tangent line or tangent segment.
Radius
-
A segment with one endpoint at the center of
a circle and the other endpoint on the circle.
Secant Line
-
A line that intersects with a circle at
two points.
Sectors
-
A region inside a circle bounded by a central angle and the minor arc
whose endpoints intersect with the rays that
compose the central angle.
Semicircle
-
A 180 degree arc.
Tangent Line
-
A line that intersects with a circle at
only one point (the point of tangency).
Tangent Segment
-
A segment with one endpoint at the point of
tangency of a circle and the other endpoint on the tangent line.
