\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 r124991 = a;
double r124992 = b;
double r124993 = r124991 + r124992;
double r124994 = c;
double r124995 = r124993 + r124994;
double r124996 = 2.0;
double r124997 = r124995 / r124996;
double r124998 = r124997 - r124991;
double r124999 = r124997 * r124998;
double r125000 = r124997 - r124992;
double r125001 = r124999 * r125000;
double r125002 = r124997 - r124994;
double r125003 = r125001 * r125002;
double r125004 = sqrt(r125003);
return r125004;
}