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25 Cards in this Set

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circle
The set of points in a plane that area given distance from a given point in the plane. The given point is the center, and the given distance is the radius.
center of a circle
the point inside the circle
radius of circle
the distance from the center to the side of the circle
congruent circles
Circles that have congruent radii.
diameter of circle
a chord that passes through the center of the circle. the distance across the circle
chord, secant
a segment whose endpoints are points on the circle
tangent circles
Coplanar circles that are tangent to the same line at the same point.
concentric circles
Circles that lie in the same plane and have the same center.
common tangent
a line of segment that is tangent to two circles
interior of a circle
all points of the plane that are inside the circle
exterior of a circle
all points of the plane that are outside the circle
point of tangency
A line in the plane of the circle that intersects the circle in exactly one point, called the point of tangency.
central angle
An angle with its vertex at the center of the circle.
minor arc and its measure
PART of a circle that measures between 180 and 360
major arc and its measure
part of a circle that measures less than 180
semicircle
The two arcs of a circle that are cut off by a diameter. The measure of a semicircle is 180.
congruent arcs
Arcs, in the same circle or in congruent circles, that have equal measures.
inscribed angle
An angle whose vertex is on a circle and whose sides contain chords of the circle.
intercepted arc
the arc that lies in the interior of an inscribed angle and has endpoints on the angle
inscribed polygon
a polygon whose vertices all lie on a circle
circumscribed circle
a circle with an inscribed polygon
tangent segment
a segment that is tangent to a circle at an endpoint
secant segment
a segment that intersects a circle in two points, with one point as an endpoint of the segment
external segment
the part of a secant segment that is not inside the circle
locus
the set of all points that satisfy a given condition or a set of given conditions