A) \[\frac{67}{8}\]
B) \[\frac{65}{4}\]
C) 4
D) 24
Correct Answer: C
Solution :
\[s=\frac{1}{2}(a+b+c)=21\] \[\Delta =\sqrt{[s(s-a)(s-b)(s-c)]}=84\]; \[\therefore \] \[r=\frac{\Delta }{s}=4\].
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