Dynamic Geometry: Incenter, Incircle,
The interactive figure above, created with GeoGebra,
shows a triangle ABC with angle bisectors AD, BE and EF intersecting at
a point called incenter. The incenter is the center of the incircle or
inscribed circle. The inradius is the radius of the incircle or
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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.