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Geometry Vocabulary (Chapter 10)
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Terms in this set (32)
adjacent arcs
Arcs of a circle that have exactly one point in common
center of a circle
The point from which all points on a circle are equidistant
central angle of a circle
An angle whose vertex is the center of a circle
chord of a circle
A segment whose endpoints are on a circle
circle
The set of all points in a plane that are equidistant from a given point
circumscribed angle
An angle whose sides are tangent to a circle
circumscribed circle
A circle that contains all the vertices of an inscribed polygon
common tangent
A line or segment that is tangent to two coplanar circles
concentric circles
Coplanar circles that have a common center
congruent arcs
Arcs that have the same measure and are arcs of the same circle or of congruent circles
congruent circles
circles that can be mapped onto each other by rigid motion or a composition of rigid motions
diameter
A chord that contains the center of a circle
external segment
The part of a secant segment that is outside the circle
inscribed angle
An angle whose vertex is on a circle and whose sides contain the chords of the circle
inscribed polygon
A polygon is which all of the vertices lie on a circle
intercepted arc
An arc that lies between two lines, rays or segments
major arc
An arc with a measure greater than 180°
measure of a major arc
The measure of a major arc's central angle
measure of a minor arc
The measure of a minor arc's central angle
minor arc
An arc with a measure less than 180°
point of tangency
The point at which a tangent line intersects a circle
radius of a circle
A segment whose endpoints are the center and any point on a circle
secant
A line that intersects a circle in two points
secant segment
A segment that contains a chord of a circle, and has exactly one endpoint outside the circle
segments of a chord
The segments formed from two chords that intersect in the interior of a circle
semicircle
An arc with endpoints that are the endpoints of a diameter
similar arcs
Arcs that have the same measure
standard equation of a circle
subtend
If the endpoints of a chord or arc lie on the sides of an inscribed angle, the chord or arcs is said to subtend the angle
tangent of a circle
A line in the plane of a circle that intersects the circle at exactly one point
tangent circles
Coplanar circles that intersect in one point
tangent segment
A segment that is tangent to a circle at an endpoint
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