Incircle and excircles of a triangle
- Author:
- Ian Barker
Triangle ABC and extended sides shown in red
Internal angle bisectors shown in green
External angle bisectors shown in blue
Some construction lines and points are hidden
Incircle and excircles touch all three sides of ABC or their extensions
Centres of the circles are at the intersections of three angle bisectors
You can adjust positionof any of the vertices A, B C
Note that the in circle is always smaller than any of the excircles