\sqrt{\left(\left(\frac{\left(a + b\right) + c}{2} \cdot \left(\frac{\left(a + b\right) + c}{2} - a\right)\right) \cdot \left(\frac{\left(a + b\right) + c}{2} - b\right)\right) \cdot \left(\frac{\left(a + b\right) + c}{2} - c\right)}double f(double a, double b, double c) {
double r65891 = a;
double r65892 = b;
double r65893 = r65891 + r65892;
double r65894 = c;
double r65895 = r65893 + r65894;
double r65896 = 2.0;
double r65897 = r65895 / r65896;
double r65898 = r65897 - r65891;
double r65899 = r65897 * r65898;
double r65900 = r65897 - r65892;
double r65901 = r65899 * r65900;
double r65902 = r65897 - r65894;
double r65903 = r65901 * r65902;
double r65904 = sqrt(r65903);
return r65904;
}