Bisectors in a Triangle
posted by Knights .
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.

Take a look at
http://gogeometry.blogspot.com/2011/06/problem626triangledistancefrom.html
For a solution to this kind of problem.
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