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What to know for the Chapter 10 Test


  • Circle, center, radius
  • Congruent circles
  • Concentric circles
  • Points inside, outside, and on a circle
  • Chord
  • The distance from the center of a circle to a chord
  • Diameter
  • Secant, secant segment, external part of a secant segment
  • Tangent to a circle, point of tangency, tangent segment
  • Common tangent (internal and external)
  • Arc, semicircle, major arc, minor arc
  • The measure of an arc
  • Congruent arcs
  • Inscribed angle
  • Tangent-Chord angle
  • Central angle
  • Chord-Chord angle
  • Secant-Secant angle
  • Secant-Tangent angle
  • Tangent-Tangent angle
  • Tangent circles (internally and externally)
  • Inscribed and circumscribed polygons (and circles!)
  • Circumference
  • Arc Length


  • A tangent to a circle is perpendicular to the radius drawn to the point of tangency
  • If a line is perpendicular to a radius at its outer endpoint, then it is tangent to the circle


  • Theorems 73 - 97

Problem Types

  • Finding the measures of arcs and angles related to circles
  • Finding lengths of chords
  • Common internal and external tangent problems
  • Finding the measure of angles and arcs related to polygons inscribed in and circumscribed about circles (including" walk-around" problems)
  • Power Theorem problems
  • Finding arc length
  • Proofs (including proving the Power Theorems!)
Other Links
Class Notes
Lesson 10-1
Lesson 10-2
Lesson 10-3
Lesson 10-4
Lesson 10-5
Quiz Topics
Lesson 10-6
Lesson 10-7
Lesson 10-8
Lesson 10-9
Test Topics
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