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It is a quadrilateral.
a triangle.
A nonagon is a nine-sided polygon.
It looks like a square with a triangle on top of it.
10 sides 10 corners (vertices), no intersecting lines a closed figure.The sides&angles are not necessarily equal, unless a regular polygon is specified. A five-pointed staractually is a 10-sided polygon (There are 5 vertices pointing 'out' and 5 pointing 'in').