"nonagon" is commonly used but mixes Latin [novem = 9] with Greek. Modern authors prefer "enneagon".
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A polygon is any closed shape with five sides
an octagon is a polygon. an octagon has 8 sides. a polygon is a shape with closed sides.
Yes it is shape it has 5 sides * * * * * A polygon is a 2-dimensional shape with 3 or more sides that are straight lines. Not sure what a polygon "on a shape" is.
You can only have a shape (like a polygon) if all sides are connected.
A quadrilateral polygon is a shape that has 4 sides.