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

  • Parallel lines, Transversals and Segments
  • Open Education 2026
  • 巧算長方形周界
  • bewijs stelling van Pythagoras
  • רישום חופשי

Discover Resources

  • CCSS IP Math I 5.6.3 Example 1
  • Terris, D Ch 8
  • Profit Inequalities polygon
  • Demo: rational coefficients for a function

Discover Topics

  • Statistics
  • Rotation
  • Area
  • Coordinates
  • Rectangle
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®