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GEOMETRYGEOMETRY Circle Terminology
Radius (or Radii for plural) The segment joining the center of a circle to a point on the circle. Example: OA
Diameter A chord that passes through the center of a circle. Example: AB
Chord A segment joining two points on a circle Example: AB
Secant A line that intersects the circle at exactly two points. Example: AB
Tangent A line that intersects a circle at exactly one point. Example: AB
Central Angle An angle whose vertex is at the center of a circle. Example: Angle ABC
Inscribed Angle An angle whose vertex is on a circle and whose sides are determined by two chords. Example: Angle ABC
Arc 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
Intercepted Arc An arc that lies in the interior of an inscribed angle. Example: Arc AC
Two Intercepted Arcs If angle is inside the circle. Example: Arc AC Arc DF
If angle is outside the circle. Example: Arc DE Arc DC Two Intercepted Arcs
GEOMETRYGEOMETRY Circle Terminology Free powerpoints at
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