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G E O M E T R Y

G E O M E T R Y. Circle Terminology. The segment joining the center of a circle to a point on the circle. Example: OA. Radius (or Radii for plural). A chord that passes through the center of a circle. Example: AB. Diameter. A segment joining two points on a circle Example: AB. Chord.

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G E O M E T R Y

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  1. GEOMETRY Circle Terminology

  2. The segment joining the center of a circle to a point on the circle. Example: OA Radius (or Radii for plural)

  3. A chord that passes through the center of a circle. Example: AB Diameter

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

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

  6. A line that intersects the circle at exactly two points. Example: AB Secant

  7. A line that intersects the circle at exactly two points. Example:AB Secant

  8. A line that intersects a circle at exactly one point. Example: AB Tangent

  9. An angle whose vertex is at the center of a circle. Example: Angle ABC Central Angle

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

  11. 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 Arc

  12. Common Tangents • A line that is tangent to 2 coplanar circles is called a common tangent.

  13. A common internal tangent intersects the segment joining the centers of the 2 circles. Internal Tangent 2 kinds of common tangents

  14. A common external tangent does not intersect the line joining the centers of the 2 circles. External Tangent 2 kinds of common tangents

  15. Example1: State the number of internal and external tangents • Internal =1 • External = 2

  16. Classwork/Homework

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