circles

•Circle Terminology GEOMETRYRadius (or Radii for plural) • The segment joining the center of a circle to a point on the circle. • Example: OA O ADiameter • A chord that passes through the center of a circle. • Example: AB O A BChord • A segment joining two points on a circle • Example: AB B A CChord • A segment joining two points on a circle • Example: AB B C ASecant • A line that intersects the circle at exactly two points. • Example: AB D C B AOSecant • A line that intersects the circle at exactly two points. • Example: AB D C B A OTangent • A line that intersects a circle at exactly one point. • Example: AB C B ACentral Angle • An angle whose vertex is at the center of a circle. • Example: Angle ABC A B CInscribed Angle • An angle whose vertex is on a circle and whose sides are determined by two chords. • Example: Angle ABC A B CArc • A figure consisting of two points on a circle and all the points on the circle needed to connect them by a single path. • Example: arc AB A BIntercepted Arc • An arc that lies in the interior of an inscribed angle. • Example: arc AC A B CTwo Intercepted Arc • If angle is inside the circle. • Example: arc AC arc DF B F A D C• If angle is outside the circle. • Example: arc DE arc DC Two Intercepted Arc E D B A C