a Heptagon is a seven sided polygon
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'poly' is from Latin and means 'many'. 'gon' , again from Latin, and means a 2-dimentional figure. So 'polygon' means a many sided two=dimensional figure.
A 'hedron' from Latin. Hence 'polyhedron' a many sided three dimensional object.
It means angle or corner. (poly gon - many angled)
Any triangle is an instance of the smallest possible polygon. Poly means many, gon means sides. You can't have a 2-sided figure, at least not in this Universe.
an n-gon