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25 Cards in this Set
 Front
 Back
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
