| A | B |
|---|
| radius | a segment from the center to a point on the edge of a circle |
| diameter | a line segment containing the center with its endpoints on the circle |
| congruent circles | if two or more circles have the same radius |
| concentric circles | have more coplanar circles that share the same center |
| arc of a circle | two points on the circle and the continous part of the circle between the two points |
| semicircles | an arc of a circle whoe endpoints are the endpoints of a diameter |
| minor arcs | an acr of an circle that is smaller than a semicircle |
| major arc | an arc of a circle that is larger than a semicircle |
| circle | set of all points in a plane at a given distance |
| central angle | the angle with its vertex at the center of the circle and sides passing through the endpoints |
| inscribe angle | has its vertex on the circle and its sides are chords |
| arc measure | the measure of the central angle |
| full circle | arc measure of 360 degrees |
| chord | a line segment whose endpoint lies on the circle |
| chord central angles conjecture | if two chords in a circle are congruent then they determine two central angles that are congruent |
| chord arcs conjecture | if two chords in a circle are congruent then their intercepted arcs are congruent |
| perpendicular to a chord conjecture | the perpendicular from the center of a circle is the bisector of the chord |
| chord distance to a center conjecture | two congruent chords in a circle are center from the center center of the circle |
| perpendicular bisector of a chord conjecture | the perpendicular bisector of a chord passes through the center of a circle |
