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

Prove the Sum of the Angles of a Triangle is 180 degrees

Author:Katherine Smith, jmorrisuk
Topic:Angles

Move the slider to

New Resources

  • Graphing Basic and Compound Inequalities
  • Modifiable Right Triangular Prism
  • Basic and Compound Inequality Illustrator
  • Midpoint Theorem Questions: Mild
  • Slope Illustrator (2)

Discover Resources

  • Geometry
  • Coxeter- Theorem 9.31 - Theorem 9.32 - Figure 9.3A
  • Inscribed angles from the same chord
  • Circle Geometry - angle in a semi-circle
  • project 3

Discover Topics

  • Special Points
  • Natural Numbers
  • Indefinite Integral
  • Ratios
  • General Quadrilateral
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®