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

© 2023 GeoGebra®

Fregier's Theorem

Author:
Judah L Schwartz
Use the white dots to select an ellipse of your choice. There is a right triangle inscribed in the ellipse. Click on the yellow dot and move it along the ellipse. There is a point on the hypotenuse of the right triangle that does not move!

New Resources

  • Angles in Parallel Lines
  • Tetrahedrons
  • Rolling two dice simultaneously - Sum of values - Exploration+Practice
  • Transforming Quadratic Function Graphs: Discovery Lesson
  • Perpendicular and Parallel Slopes

Discover Resources

  • true/Thales2.ggb
  • Computer Art
  • POLÍGONO
  • PossibleTrianglesGivenTwoSidesandOneOppositeAngleEx1
  • O Canada

Discover Topics

  • Vectors
  • Hypothesis Testing
  • Isosceles Triangles
  • Fractions
  • Pie Chart or Circle Chart

GeoGebra

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

Apps

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

Resources

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