No
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A polygon is a two dimensional shape bounded by straight lines. The moon is neither a plane shape (though it may appear as such), and it is clearly not bounded by straight 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.