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We will get the answer by the help of the following formula: R=S/p, (R is radius,  is area of the triangle and p is parameter of triangle)


S= sq root [18(18-13)(18-14)(18-15)]= 32.86

R=32.86/18=1.8 (ans)
0 0 0
but there is no 1.8 option to this particular question
then choose what is most close
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