#include
#include
using namespace std;
int main()
{
float a;
float b;
float c;
float s;
float p;
coutb>>c;
p=(a+b+c)/2;
s=sqrt(p*(p-a)*(p-b)*(p-c));
cout
#include
#include
using namespace std;
int main()
{
float a;
float b;
float c;
float s;
float p;
coutb>>c;
p=(a+b+c)/2;
s=sqrt(p*(p-a)*(p-b)*(p-c));
cout