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

Proof of the angle sum of a triangle.

Author:Lesley Skipper
Topic:Angles
A proof that the angles in a triangle add to 180 degrees.

New Resources

  • Average Value
  • Average Value of a Function
  • רישום חופשי
  • Neuberg's Theorem
  • Linear Systems + Relationships Between Coefficients and Solutions

Discover Resources

  • circumcenter
  • tkng1
  • Medians In A Triangle
  • สื่อการสอน การบวกจำนวนเต็ม
  • Testing the Converse of PT

Discover Topics

  • Special Points
  • Variance
  • Vectors 3D (Three-Dimensional)
  • Interest Calculation
  • Geometric Mean
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

© 2025 GeoGebra®