#include <stdio.h> #include <math.h> int main(){ int a,b,c; double S,p; while(scanf("%d %d %d",&a,&b,&c)!=EOF){ p=(a+b+c)/2.0; S=sqrt(p*(p-a)*(p-b)*(p-c)); printf("%.2lf",S); } return 0; }
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