Search
Google ClassroomGoogle Classroom
GeoGebraGeoGebra Classroom
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

  • Angle Addition: Warm Up Exercises
  • Damped Trochoidal Curve
  • גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם
  • ¿Quién llegará más lejos en el mundial?
  • Untitled

Discover Resources

  • The Incenter, Gergonne Point, and Tritangent Circles
  • Negative_angles
  • Samsun-Turkey Symmetry
  • Lines of Best Fit 1
  • Stephanie_1.08
  • Finding Angles of a parallelogram

Discover Topics

  • Orthocenter
  • Set Theory
  • Integers
  • Triangles
  • Random Variables
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®