A polygon with 3 sides is called triangle
A polygon with 4 sides is called quadrilateral
A polygon with 5 sides is called pentagon
A polygon with 6 sides is called hexagon
A polygon with 7 sides is called heptagon
A polygon with 8 sides is called octagon
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They are called regular polygons
Prism
If the octagon is a regular octagon (all eight sides and all eight angles are equal), then it is a regular polygon. If it is not a regular octagon (i.e. if it is an irregular octagon) then is it an irregular polygon.