#include<stdio.h> #include<math.h> int main() { double a,b,c; double s,p; scanf("%lf %lf %lf", &a, &b, &c); p = (a+b+c)/2.0; s = sqrt(p*(p-a)*(p-b)*(p-c)); printf("%.2lf", s); return 0; }
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