| A | B |
|---|
| chord | segment whose endpoints lie on a circle |
| central angle | angle whose vertiex is the center of a circle |
| inscribed angle | angle whose vertex lies on a circle and whose sides contain chords of the circle |
| arc | continuous portion of a circle consisting of two points on the circle |
| minor arc | arc whose points are on or in the interior of a central angle |
| major arc | arc whose points are on or in the exterior of a central angle |
| semicircle | arc whose endpoints are the endpoints of a diameter |
| adjacent arcs | arcs that share an endpoint |
| intercepted arc | an arc defined by an inscribed or central angle |
| circumscribed circle | of a polygon, the circle passes through all of the polygon's vertices |
| circumcircle | circles that circumscribes a polygon |
| circumcenter | the point where all perpendicular bisectors of a triangle intersect |
