/// <summary>
/// Calculates area of triangle using heron's formula
/// </summary>
/// <param name="a1"></param>
/// <param name="a2"></param>
/// <param name="a3"></param>
/// <returns></returns>
public static double Heron(Atom a1, Atom a2, Atom a3)
{
var a = a1.DistanceTo(a2);
var b = a2.DistanceTo(a3);
var c = a3.DistanceTo(a1);
var sqrt = (a + b + c) * (-a + b + c) * (a - b + c) * (a + b - c);
return(1f / 4f * MathF.Sqrt(sqrt));
}
