Three Lines
Three lines can be:
1) Parallel (this means they have the same slope and never cross)
2) Intersecting at different points
(this means they have different slopes and eventually form a triangle)
3) Perpendicular
(technically this is a subset of intersecting lines with the idea that their slopes are opposite and reciprocal, or you are dealing with vertical and horizontal lines)
4) Intersecting at a common point of concurrency (again another special case of intersecting)
5) Intersecting with parallel lines and a single transversal line
(special angles with special properties are created)
Two Parallel Lines cut by a Transversal |