R=abc/(4S); p=(13+14+15)/2=21
S=√(p(p-a)(p-b)(p-c)=√(21*8*7*6)=84
R=13*14*15/84=4.125
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R=abc/(4S); p=(13+14+15)/2=21
S=√(p(p-a)(p-b)(p-c)=√(21*8*7*6)=84
R=13*14*15/84=4.125