#include <iostream>
#include <cmath>
using namespace std;
int main() {
float l1,l2,l3,t,area,x;
cout << "Ingrese lado1, lado2 y lado3:";
cin >> l1 >> l2 >> l3;
t = (l1+l2+l3)/2;
x = (l1-t)*(l2-t)*(l3-t);
if (x >= 0) {
area = sqrt(x);
cout << "El area del triangulo es " << area << endl;
}
else
cout << "No existe raiz de un numero negativo" << endl;
return 0;
}