12. Whatever number you say before '-gon' is referring to the number of sides in the shape. However, 12-gon (or 20-gon, or whatever) is not the official name of any polygon but is commonly used. the commonly used name is a do-decagon
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name of a polygon with 12 sides = dodecagon
16 sides!
There are 18 sides
584 sides on a 100-Gon
27 sides A 27-gon is any shape with 27 sides.