No.
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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.
An octahedron is not a polygon. A polygon is a two dimensional shape. An octahedron is a three dimensional shape and is classified as a polyhedron.