Posted by Knights on Tuesday, March 26, 2013 at 8:20am.
Let ABC have side lengths AB=13, AC=14, and BC=15. There are two circles located inside <BAC which are tangent to rays AB, AC , and segment BC. Compute the distance between the centers of these two circles.

Bisectors in a Triangle  Steve, Tuesday, March 26, 2013 at 12:15pm
Take a look at
http://gogeometry.blogspot.com/2011/06/problem626triangledistancefrom.html
For a solution to this kind of problem.