Answer
r=3$\frac{1}{3}$
Work Step by Step
semiperimeter=.5(13+13+10)
s=18
r=$\frac{2\sqrt {s(s-a)(s-b)(s-c)}}{a+b+c}$
r=$\frac{2\sqrt {18(18-10)(18-13)(18-13)}}{10+13+13}$
r=$\frac{2\sqrt {3600}}{36}$
r=$\frac{120}{36}$
r=3$\frac{1}{3}$
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