#include<stdio.h> #include<math.h> int main(){ int a,b,c; double p,s; while(scanf("%d%d%d",&a,&b,&c)!=EOF) { p=1.0*(a+b+c)/2; s=sqrt(p*(p-a)*(p-b)*(p-c)); printf("%0.2f\n",s); } return 0; }
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