2.(ii) Give a definition for each of the following terms. Are there other terms that need to be defined first? What are they, and how might you define them? (ii) perpendicular lines
Yes, there are other terms that are needed to be defined first which are:
Plane: A plane is a flat surface on which geometric figures are drawn.
Point: A point is a dimensionless dot which is drawn on a plane surface.
Line: A line is the collection of n number of points which can extend in both the directions and has only one dimension.
ii) perpendicular line:-
If two lines intersect with each other and make a right angle at the point of intersection. Then, two lines are called perpendicular lines.