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