Angle Bisectors in a Triangle
The angle bisectors of a triangle ABC meet in a single point called the incenter. The incenter M is equidistant from the three sides of the triangle. The incenter is the center of the incircle, the largest circle inside ABC. The incircle is tangent to all three sides.[more]
You can change the locations of E, H, and K on the angle bisectors.
If DE and EF are the perpendiculars from E to AC and AB, then |DE| = |EF|. Similarly, |GH| = |HI| and |JK| = |KL|.[less]
For more information visit Anatomy of Triangles.