hectogon, centagon
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hectogon, centagon
The name of a 12 sided polygon is Dodecagon.
A 8 sided polygon is called a octagon.
An 800-sided polygon is called an octahectagon. The prefix "octa-" denotes eight, while "-hectagon" indicates a polygon with 100 sides. Therefore, an octahectagon has 8 * 100 = 800 sides.
The name of a 19 sided polygon is enneadecagon.