= Septagon =
A 7-sided polygon (a flat shape with straight sides).
(Also called Heptagon)
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There is no such thing as a two-sided object.
NO!!! It is a seven(7) - sided 2-dimensional polygon. A Heptahedron is a seven(7) -sided 3-dimensional object.
the Greeks used prefexes up to ten, modernly we have sdded dodecagon for a twelvesided object and undecagon for an eleven sided object so the propor name would be a 27 sided object.
An octogon
A hexagon