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