#include<stdio.h> #include<string.h> #include<math.h> #define S(a,b,c) ((a + b + c) / 2) #define AREA(a,b,c) sqrt(S(a,b,c)*(S(a,b,c)-a)*(S(a,b,c)-b)*(S(a,b,c)-c)) int main() { float a,b,c,area; scanf("%f%f%f",&a,&b,&c); area = AREA(a,b,c); printf("%.2f",area); } |
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