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