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