If you are speaking of a hypothetical two dimensional line, then while there are two different sides one could be on in relation to it, there are no sides to the line itself.
If you are speaking of a straight line actually drawn, then there are four sides, for it can't help but to have a tiny amount of "width", thus making it a very thin rectangle.
(One could be even more exact and note that the line drawn on paper not only has a bit of width, but an even smaller amount of "depth" in it's coating of the paper. Thus that straight line has six sides, being a very thin rectangular tube.)
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A line segment is a straight line that has an endpoint on both sides (look below). ----
A polygon is a closed 2-D shape with sides made from straight line segments.
There are no polygons (shapes with only straight-line sides) with fewer than three sides, but if you allow shapes with curved sides there are many possibilities. Examples include semicircles, annuli (donut shaped), and crescents.From Caromal, and Izzyk9God just say a CONE!!!
How many of these 30° angles will fit together to make a straight line?
one.