A circle; a line; or a shape composed of connected lines that do not make a single closed path. Sometimes people say a circle is in fact a polygon with an infinite number of sides. But a closed shape with an infinite number of sides would have to be made of sides with a length of zero; such "sides" are points and not lines. A circle does not therefore meet the definition of a polygon.
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It has less than three sides.
A polygon is any closed shape with five sides
An internal angle of the polygon.
A shape is not considered a polygon. For example, a circle is not a polygon. So the question is based on a misunderstanding.
The polygon is not a arrow. It is a shape.