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

The nine point circle

Author:
Zoltán Kovács
Topic:
Circle
The nine-point circle can be constructed for any given triangle. It passes through nine significant concyclic points defined from the triangle. Those are: the midpoint of each side of the triangle, the foot of each altitude and the midpoint of the line segment from each vertex of the triangle to the orthocenter.

New Resources

  • Operator norm calculator
  • A1_4.04 Two variable linear inequalities 278287
  • Open Middle: Perimeter of a Rectangle
  • A coffee cup and a doughnut
  • Open Middle: Linear Function to Cone

Discover Resources

  • Project (1)
  • MapToTorus
  • الوتر القطر ونصف القطر في الدائرة
  • construct a square
  • Water Triangle

Discover Topics

  • Cosine
  • Secant Line or Secant
  • Parallelogram
  • Scatter Plot
  • Median Value

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