#include<stdio.h> #include<math.h> int main(){ int a,b,c; float d,s; while(scanf("%d%d%d",&a,&b,&c)!=EOF){ d=(a+b+c)/2.0; s=sqrt(d*(d-a)*(d-b)*(d-c)); printf("area=%.2f\n",s); } return 0; }
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