A nonagon.
A hexagon.
Heptagon or septagon
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A hexagon is a poloygon.
a poloygon that does not curve or cross and is closed
A 5-sided figure is a 'pentagon'.
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5 sided shape = pentagon ._ /. \ \_/
A 5 sided polygon is a pentagon
A 5-sided 2-dimensional figure is a pentagon and a 5-sided 3-dimensional shape is a pentahedron.
A pentagon is a 5 sided, closed figure.