public double DistanceTo(Vector2D vV) { return this.Add(vV.Inv()).Length; }
public double AngleTo(Vector2D vV) { return this.Add(vV.Inv()).Angle; }
public double DistanceTo(Vector2D vV) { return this.Add(vV.Inv()).Length; }
public double AngleTo(Vector2D vV) { return this.Add(vV.Inv()).Angle; }