What is the radius of the circle inscribed in triangle ABC if AB = 5, AC=6, BC=8? Express your answer in simplest radical form.
The radius is 2*sqrt(3).
a = 5 b = 6 c = 8
s = 1/2(a+b+c)
A = sqrt[s(s-a)(s-b)(s-c)]
r = A/s
