Geometrical Interpretation of Vectors Addition
I don't understand what it means by
This is the part of the book:
The directed line segment PQ, from the point to the point , has the same length and direction as the directed line segment from the origin to the point . Furthermore, this is the only segment emanating from the origin which has the same length and direction as PQ. Thus, if one agrees to treat only vectors which emanate from the origin, there is exactly one vector associated with each given length and direction.