Dynamic Geometry 1450: Ortholine, Steiner Line

The orthocenters of the four components triangles (BCE, ABF, ADE, CDF) of a complete quadrilateral ABCDEF lie on a line called Ortholine or Steiner Line.

Complete quadrilateral

Complete quadrilateral ABCDEF is the figure determined by four lines, no three of which are concurrent, and their six points of intersection A, B, D, C, E, and F.

Orthocenter

The orthocenter is the intersection of the three altitudes of a triangle.


Static Diagram of the Ortholine or Steiner Line

Dynamic Geometry 1450: Ortholine, Steiner Line. Using GeoGebra


Step-by-step diagrams after exporting from GeoGebra

Step-b-step diagrams exporting prom geogebra, Dynamic Geometry 1450: Ortholine, Steiner Line.


Poster of the Ortholine or Steiner Line using iPad Apps

Poster of Ortholine or Steiner Line, Dynamic Geometry. Using iPad

Classroom Resource:
Interactive step-by-step animation using GeoGebra

This step-by-step interactive illustration was created with GeoGebra.

  • To explore (show / hide): click/tap a check box.
  • To stop/play the animation: click/tap the icon in the lower left corner.
  • To go to first step: click/tap the "Go to step 1" button.
  • To manipulate the interactive figure: click/tap and drag the points or figures.

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