\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 r100315 = a;
double r100316 = b;
double r100317 = r100315 + r100316;
double r100318 = c;
double r100319 = r100317 + r100318;
double r100320 = 2.0;
double r100321 = r100319 / r100320;
double r100322 = r100321 - r100315;
double r100323 = r100321 * r100322;
double r100324 = r100321 - r100316;
double r100325 = r100323 * r100324;
double r100326 = r100321 - r100318;
double r100327 = r100325 * r100326;
double r100328 = sqrt(r100327);
return r100328;
}