No, a line is not a polygon. A polygon is a closed plane area bounded by straight sides. A line, by itself, does not contain an area.
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The sides of a polygon are straight line boundaries of the polygon.
concave polygon
a polygon a polygon * * * * * No it is not! If the line is in that plane then it is the whole line. If not, it is a single point.
No, because it has no line segments
a polygon in which any line segment connecting two points of the polygon has no part outside the polygon.