A polygon has as many corners (vertices) as it has sides.
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A pentagon is any polygon with 5 sides and 5 corners.
4 sides and 4 corners because it is a quadrilateral polygon
A triangle is the only polygon with 3 corners (vertices). There is no polyhedron with 3 corners.
Hexagon A polygon with 6 corners is a hexagon, the prefix hex means six.
A polygon with eleven sides and corners is called a hendecagon. Occasionally, it may be referred to as an undecagon.