Dynamic Geometry: Euler Line
The interactive figure above, created with GeoGebra,
shows a triangle ABC with the Euler Line HGO.
In a triangle ABC, the orthocenter H, centroid G, and circumcenter O always lie on a straight line, called the Euler line.
To explore (show / hide): tap a check box.
To stop/play the animation: tap the icon in the
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GeoGebra is free and multi-platform dynamic mathematics software for all levels of education that joins geometry, algebra, tables, graphing, statistics and calculus
application, intended for teachers and students. Many parts of GeoGebra have
been ported to HTML5. It has received several educational software awards in Europe and the USA.