Search
Google ClassroomGoogle Classroom
GeoGebraGeoGebra Classroom

Outline

  1. Circle Theorems
    1. Alternate Segment Theorem (proof)
    2. Alternate Segment Theorem (page 2)
    3. Alternate Segment Theorem (page 1)
    4. Angle in a semi-circle
    5. Simple Angle at the Centre
    6. Angle at the centre (page 2)
    7. Angle at the centre (page 3)
    8. Common Tangents to a Circle (Proof)

Circle Theorems

Author:Chris Luke
Topic:Circle
Circle theorems for GCSE

  • Alternate Segment Theorem (proof)

  • Alternate Segment Theorem (page 2)

  • Alternate Segment Theorem (page 1)

  • Angle in a semi-circle

  • Simple Angle at the Centre

  • Angle at the centre (page 2)

  • Angle at the centre (page 3)

  • Common Tangents to a Circle (Proof)

Next
Alternate Segment Theorem (proof)

New Resources

  • Prism Drawn in 1-Point Perspective
  • Volume by Disk/Washer around y
  • Shells
  • Making New Year's resolutions for 2026
  • Pitfalls of Disk/Washer Method

Discover Resources

  • reflection tessellation rhombus step 1
  • external triangle angles
  • Seka3
  • Congruency of triangles

Discover Topics

  • Complex Numbers
  • Linear Regression
  • Similar Triangles
  • Pyramid
  • Multiplication
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®