\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 r98985 = a;
double r98986 = b;
double r98987 = r98985 + r98986;
double r98988 = c;
double r98989 = r98987 + r98988;
double r98990 = 2.0;
double r98991 = r98989 / r98990;
double r98992 = r98991 - r98985;
double r98993 = r98991 * r98992;
double r98994 = r98991 - r98986;
double r98995 = r98993 * r98994;
double r98996 = r98991 - r98988;
double r98997 = r98995 * r98996;
double r98998 = sqrt(r98997);
return r98998;
}