2.1 Representando vectores 2D

The 2D world is flat like a piece of paper or a computer screen. In the language of math, a flat, 2D space is referred to as a plane. An object living in a 2D plane has the two dimensions of height and width but no third dimension of depth. Likewise, you can describe locations in 2D by two pieces of information: their vertical and horizontal positions. To describe the location of points in the plane, you need a reference point. We call that special reference point the origin. Figure 2.1 shows this relationship.

There are many points to choose from, but we have