"Lines" is the plural of "line" which is a series of points each of which is contiguous only to two other points in the series. It is also used to describe a line segment which is a line which terminates at each end with a point.
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4 points of intersection, meaning 4 lines
None.
There is no deep meaning to it.
A closed polygon consists of straight lines and is closed, meaning all lines form a closed chain. Polygons are two dimensional shapes.
There are three general classification of lines. They are vertical lines (alert, rigid, defy gravity, awake, firm, strong, stable), horizontal lines (serenity, calmness, passivity, quit, restful), diagonal lines (active, dynamic, restless, unstable, busy, sporty) and horizontal lines in combination with vertical lines to create equilibrium (stillness).