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