Search
Google ClassroomGoogle Classroom
GeoGebraGeoGebra Lesson
GeoGebra
  • Home
  • Resources
  • Profile
  • Classroom
  • App Downloads

Catriona Shearer: Triangle and Semicircle

Author:John Golden
Topic:Angles, Area
Another delightful puzzle, with a surprising (to me) relation. From: Catriona Shearer on Twitter 

New Resources

  • Building Algebra Tile Models for Trinomials
  • Right Triangle Inscribed in a Semicircle
  • 繪畫垂直線
  • Laundry Basket
  • Midpoint Theorem (V2): Integer Solutions

Discover Resources

  • Interactive Graphing Parabola Ex 1A
  • Lab1 measure g x-t graph
  • Moveable 90
  • Borders PBL Q2
  • Revolving about a vertical line ADVANCED (Washer Method)

Discover Topics

  • Statistical Characteristics
  • Natural Numbers
  • Standard Deviation
  • Arithmetic
  • Special Points
AboutPartnersHelp Centre
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®