1. Kinds of lines
 A vertical line is a kind of line that is drawn in upright
position. It goes from North to South or vice versa.
 A kind of line that lies flat on a surface is a horizontal line.
It goes from East to West and vice versa.
 A diagonal is also called as slanted line. This kind of line
has inclined position.

2.  Intersecting lines are a pair of
lines that meet at a common
point. The common is called
the point of intersection.

3.  Parallel lines are a pair of
lines that go to the same
direction. They are
equidistant and never
intersect.

4.  A pair of intersecting lines (vertical
and horizontal)that form four right
angles at their point of intersection
is called perpendicular lines.