Studied by 78 peoplecircle
set of all points in a plane that are equidistant from a given point
radius
a segment whose endpoints are the center and any point on a circle
chord
a segment whose endpoints are on a circle
diameter
a chord that contains the center of a circle
secant
a line that intersects a circle in two points
tangent
a line in the plane of a circle that intersects the circle in exactly one point
tangent circles
coplanar circles that intersect in one point
concentric circles
coplanar circles that have a common center
common tangent
a line or segment that is tangent to two coplanar circles
central angle
an angle whose vertex is the center of the circle
semicircle
an arc with endpoints that are the endpoints of a diameter; exactly 180 degrees
minor arc
an arc that is less than 180, named by their endpoints
major arc
an arc that is more than 180, named by their endpoints and a point on the arc
adjacent arcs
two arcs that intersect at exactly one point
congruent arcs
two arcs that have the same measure and they’re arcs of the same circles or of congruent circles
inscribed angle
an angle whose vertex is on a circle and whose sides contain chords of the circle
intercepted arc
an arc that lies between two lines, rays, or segments
inscribed polygon
a polygon that has all its vertices on a circle
circumscribed circle
the circle that contains an inscribed polygon’s vertices
circumscribed angle
an angle whose sides are tangent to a circle
tangent segment
a segment that is tangent to a circle at an endpoint
secant segment
a segment that contains a chord of a circle and has exactly one endpoint outside the circle
Note
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