The question is based on a complete misunderstanding of what a polygon is. A plane figure is not necessarily a polygon. The following are some examples of plane figures which are not polygons:
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A circle?
A polygon is a plane figure with 3 or more straight sides and angles. A plane figure is a flat enclosed figure made of straight lines, curved lines, or both.
a closed plane figure with 3 or more line segments is a polygon
A circle is one example of a plane figure that is not a polygon. A V is also not a polygon.
true