The interactive figure above, created with GeoGebra, shows a triangle ABC
with the Internal Feuerbach point of a triangle ABC.
To manipulate the interactive figure: tap and drag points or lines.
To stop/play the animation: tap the icon in the
lower left corner.
To reset the interactive figure to its initial state: tap the icon in the
upper right corner.
To explore (show / hide): tap a check box.
Internal Feuerbach Point
The nine point circle and the incircle of a triangle ABC are tangent a point
called Internal Feuerbach Point.
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.