They are 2-dimensional shapes.
They are enclosed by straight lines that meet pairwise - ie do not cross.
The sum of the exterior angles is 360 degrees.
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They are all polygons having their own particular properties
Polygons are flat shapes with many sides
they are all polygons
Not all shapes are polygons. Polygons are shapes that have to have straight sides and be closed figures. So a shape that is curved would not be a polygon.
They are known as regular polygons.