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

Feuerbach's Theorem

Author:
V8frr
Feuerbach's theorem, which states that the nine-point circle is tangent to the three excircles of the triangle as well as its incircle. Drag A, B and C to see that this reamins invariable for any triangle.

New Resources

  • Lambourghini Turning Angles
  • Umbrella Holder
  • Sector Area Question Generator
  • Arc Length and Sector Area
  • Open Middle: Graphing Linear Inequalities (3)

Discover Resources

  • patron
  • Graphs
  • Trunchi de piramidă.
  • Bernoulli's Lemniscate Formed from an Isosceles Trapezoid
  • SIMULATION-5

Discover Topics

  • Median Value
  • Coordinates
  • Kite
  • Reflection
  • Differential Calculus

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