Search

Outline

  1. Circle Theorems
    1. Angle at the circumference versus the angle at the centre
    2. Angle at the circumference of a semi-circle
    3. Same Segment Theorem
    4. Cyclic Quadrilateral
    5. Alternate segment theorem
    6. Tangents and Radii

Circle Theorems

Author:Godfrey Almeida
Topic:Circle
Building on one circle theorem, how can you work out the majority of the others?

  • Angle at the circumference versus the angle at the centre

  • Angle at the circumference of a semi-circle

  • Same Segment Theorem

  • Cyclic Quadrilateral

  • Alternate segment theorem

  • Tangents and Radii

Next
Angle at the circumference versus the angle at the centre

New Resources

  • Rule of Sarrus - Determinant of a 3×3 Matrix
  • Domain of f(x,y)
  • רישום חופשי
  • Sum of Squares: Proof without Words
  • גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם

Discover Resources

  • twocircles-small-void
  • square construction
  • GeoCircles3.1_1
  • practice
  • Some terms & definitions. Angles, angle pairs, angle measure
  • Circle Of Curvature For A Parabolic Path

Discover Topics

  • Numbers
  • Integral Calculus
  • Logic
  • Hyperbola
  • Linear Regression
AboutPartnersHelp Center
Terms of ServicePrivacyLicense
Graphing CalculatorCalculator SuiteMath Resources

Download our apps here:

Download_on_the_App_Store_Badge_US-UK_RGB_blk_4SVG_092917

© 2026 GeoGebra®