Dynamic Geometry: Simson Line
The interactive figure above, created with GeoGebra,
shows a triangle ABC with the Simson Line DEF.
The Simson line of a triangle ABC is the line containing the feet D,E, and F of the perpendiculars from a point P on the circumcircle to the sides AB, BC, and AC.
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GeoGebra
GeoGebra is free and multiplatform 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.
