\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 r129423 = a;
double r129424 = b;
double r129425 = r129423 + r129424;
double r129426 = c;
double r129427 = r129425 + r129426;
double r129428 = 2.0;
double r129429 = r129427 / r129428;
double r129430 = r129429 - r129423;
double r129431 = r129429 * r129430;
double r129432 = r129429 - r129424;
double r129433 = r129431 * r129432;
double r129434 = r129429 - r129426;
double r129435 = r129433 * r129434;
double r129436 = sqrt(r129435);
return r129436;
}