A line?? It's impossible to have a polygon with only one side, hence the "poly" meaning many.
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There is not a name for such a polygon. A polygon with one million sides is called a megagon though..
megagon (hecatomyriagon)
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
A twenty-one-ogon.
the name of the polygon with 101 sides is hecatontakaihenagon