#include<stdio.h> #include<math.h> void main( ) { int a,b,c; float p,S=0; 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("%.2f\n",S); } return 0; }
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