A line segment
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A polygon is defined as "a plane figure that is bounded by a finite chain of straight line segments closing in a loop to form a closed chain or circuit"... So - Yes.
NO, a circle is not a polygon. A polygon is composed of a finite set of straight line segments, and a circle has NO straight line segments.
Any Polygon can be a regular figure, if the figure has all straight sides and edges, with all the same length. If the decagon had all straight edges, sides, and same lengths of sides, it would be a regular figure. Otherwise, it would not, and would be an irregular Decagon. * * * * * That is not a correct answer. Any polygon, by definition MUST have all straight sides (which are the same as edges). What makes a polygon regular is that all the sides are the same length AND that all the interior angles are the same measure. Both these conditions must be met.
A semicircle is an example of a figure with one straight line. It is a circle that has been split along the diameter.