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