#include <stdio.h> #include <string.h> #include <math.h> #include <stdlib.h> #define N 1000 int main() { float a,b,c, s; while(scanf("%f %f %f",&a,&b,&c)!=EOF){ s=sqrt((a+b+c)*(a+b-c)*(a+c-b)*(b+c-a))/4; printf("%.2f", s); } return 0; } |
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