Geometry construction using a compass and straightedge

As can be seen in
Incenter of a Triangle,
the three
angle bisectors
of any triangle always pass through its incenter.
In this construction, we only use two, as this is sufficient to define the point where they
intersect.
We bisect the two angles using the method described in
Bisecting an Angle. The point where the bisectors cross is the incenter.
We then draw a circle that just touches the triangles's sides.

Click here for a printable incircle worksheet containing two problems to try.
When you get to the page, use the browser print command to print as many as you wish. The printed output is not copyright.