\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 r99471 = a;
double r99472 = b;
double r99473 = r99471 + r99472;
double r99474 = c;
double r99475 = r99473 + r99474;
double r99476 = 2.0;
double r99477 = r99475 / r99476;
double r99478 = r99477 - r99471;
double r99479 = r99477 * r99478;
double r99480 = r99477 - r99472;
double r99481 = r99479 * r99480;
double r99482 = r99477 - r99474;
double r99483 = r99481 * r99482;
double r99484 = sqrt(r99483);
return r99484;
}