# Incenter finder

- Author:
- Judah L Schwartz

- Topic:
- Geometry

Triangle ABC
line f is the angle bisector of ABC
line g is the angle bisector of BCA
Point O is the intersection of lines f & g
Segment OD is perpendicular to BC
.
The length of OD is the radius of the incircle
whose center is at O.

**What question could / would you ask your students based on this applet ?**.