GeoGebra
  • Create Lesson
GeoGebra
  • Home
  • News Feed
  • Resources
  • Profile
  • People
  • Classroom
  • App Downloads
About GeoGebra
Contact us: office@geogebra.org
Terms of Service – Privacy – License

© 2022 GeoGebra

Triangle Exterior Angle Exploration

Author:
Kim Kembitzky, Tim Brzezinski
Topic:
Angles
In the applet below, an exterior angle of a triangle is shown. The pink angle and green angle are referred to as remote interior angles with respect to this exterior angle. What can you conclude about the measure of an exterior angle of a triangle with respect to its 2 remote interior angles? What other theorem is readily made obvious here?

New Resources

  • Music Box with Rotating Ballerina
  • Substitution Fractal
  • G_10.04 Parallel and perpendicular lines_1a
  • Demo: dashed trace
  • G_3.03 Triangle inequalities

Discover Resources

  • CCGPS AA 6.3.2 Example 1
  • Exterior Angles of Polygons
  • Newton & Aristotle - two ideas about motion
  • Ryan Grad 11/16
  • geometry

Discover Topics

  • Parallelogram
  • Indefinite Integral
  • Calculus
  • Geometric Mean
  • Continuity

GeoGebra

  • About
  • Partners
  • GeoGebra on Tests
  • News Feed
  • App Downloads

Apps

  • Calculator Suite
  • Graphing Calculator
  • 3D Calculator
  • CAS Calculator
  • Scientific Calculator

Resources

  • Classroom Resources
  • Learn GeoGebra
  • Classroom
  • Geometry
  • Notes
  • Terms of Service Privacy License
  • Facebook Twitter YouTube