#include <stdio.h> #include <math.h> int main (){ double a,b,c,p,S; while(scanf("%lf %lf %lf",&a,&b,&c)!=EOF){ p=(a+b+c)/2.0; S=sqrt(p*(p-a)*(p-b)*(p-c)); printf("%0.2lf",S); return 0; } }
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