#include <stdio.h> #include <math.h> int main() { int a,b,c; float l,S; while(a!=-1){ scanf("%d %d %d",&a,&b,&c); l=(a+b+c)/2.0; S=sqrt(l*(l-a)*(l-b)*(l-c)); printf("%.2f\n",S); } return 0; }
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