/// <summary>
///
/// </summary>
/// <param name="v"></param>
/// <returns></returns>
public double Angle(Vector2D v)
{
return(AngleUtility.Diff(v.Angle(), Angle()));
}
/// <summary>
///
/// </summary>
/// <param name="v"></param>
/// <returns></returns>
public double Angle(Vector2D v)
{
return(AngleUtility.Diff(v.Angle(), Angle()));
}