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Circle Geometry Terminology and Concepts

Learn about key terms in circle geometry such as radius, diameter, chord, secant, tangent, central angle, inscribed angle, arc, and intercepted arc. Explore measures of angles related to circles with interactive resources. Enhance your understanding of geometric concepts related to circles through detailed explanations and examples.

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Circle Geometry Terminology and Concepts

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  1. GEOMETRY Circle Terminology

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

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

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

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

  6. Secant A • A line that intersects the circle at exactly two points. C O • Example: AB D B

  7. Secant A C • A line that intersects the circle at exactly two points. O • Example:AB D B

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

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

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

  11. Arc B • A figure consisting of two points on a circle and all the points on the circle needed to connect them by a single path. A • Example: arc AB

  12. Intercepted Arc • An arc that lies in the interior of an inscribed angle. B A • Example: arc AC C

  13. Two Intercepted Arc D • If angle is inside the circle. A • Example: arc AC B arc DF C F

  14. Two Intercepted Arc • If angle is outside the circle. B D E A • Example: arc DE arc DC C

  15. Investigating Measures of Angles Related to a Circle • Click on GSP 4.00 on the desktop. • Follow the instructions on the handout.

  16. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.

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