Yes
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The sides of a polygon are straight line boundaries of the polygon.
Yes. A polygon can't have curved sides. do
No. Remember that the sides of a polygon must be straight.
Basically, the meaning of a polygon is closed because the sides are straight. A meaning of a polygon for you: a square. A square has 4 sides that are all straight, a square is a polygon.
A polygon is a shape that is closed with straight sides and the sides do not overlap like these. I don't know if an arrow is a polygon.