float TriangleArea(int A, int B, int C)
{
    // Heron's formula: Area = sqrt(s(s-a)(s-b)(s-c))
    // where s is the semi-perimeter
    float s = (A + B + C) / 2.0;
    return sqrt(s * (s - A) * (s - B) * (s - C));
}