public double SignedAngleTo(Vector2D v2, bool clockWise, bool returnNegative = false);
public Vector2D Subtract(Vector2D v);
public bool IsPerpendicularTo(Vector2D othervector, double tolerance = 1e-010);
public Vector2D ProjectOn(Vector2D other);
public bool Equals(Vector2D other, double tolerance);
public bool IsParallelTo(Vector2D othervector, double tolerance = 1e-010);
public bool Equals(Vector2D other);
public double DotProduct(Vector2D other);
public double CrossProduct(Vector2D other);
public double AngleTo(Vector2D toVector2D);
public Vector2D Add(Vector2D v);
