#include<stdio.h> #include<math.h> int main() { int a,b,c; scanf("%d%d%d", &a,&b,&c); double s1 =(a+b+c)/2.0; double s2= (s1-a)*(s1-b)*(s1-c)*s1; s2=sqrt(s2); printf("%.2f", s2 ); return 0 ; }
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