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GEOMETRY Circle Terminology

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**Radius (or Radii for plural)**

The segment joining the center of a circle to a point on the circle. Example: OA

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**Diameter A chord that passes through the center of a circle.**

Example: AB

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Chord A segment joining two points on a circle Example: AB

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**Secant A line that intersects the circle at exactly two points.**

Example: AB

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**Tangent A line that intersects a circle at exactly one point.**

Example: AB

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**Central Angle An angle whose vertex is at the center of a circle.**

Example: Angle ABC

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Inscribed Angle An angle whose vertex is on a circle and whose sides are determined by two chords. Example: Angle ABC

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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

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Intercepted Arc An arc that lies in the interior of an inscribed angle. Example: Arc AC

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**Two Intercepted Arcs If angle is inside the circle. Example: Arc AC**

Arc DF

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**Two Intercepted Arcs If angle is outside the circle. Example: Arc DE**

Arc DC

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10.1 – Tangents to Circles. A circle is a set of points in a plane at a given distance from a given point in the plane. The given point is a center. CENTER.

10.1 – Tangents to Circles. A circle is a set of points in a plane at a given distance from a given point in the plane. The given point is a center. CENTER.

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