ABSTRACT
The unit vector that is perpendicular to a line is referred to as the normal to the line. Figure 3.3 shows two families of lines: one family of lines shares a common point and the other family of lines shares the same normal. Just as there are different ways to specify a line geometrically, there are different mathematical representations: para-
and the advantages of each will be explained. Additionally, we will explore how to convert from one form to another.
