It's quite acceptable to call it a 40-agon but what's more important is knowing how to work out its properties
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I find the name "30-sided polygon", "40-sided polygon", etc. just fine.
name of 4000 sided polygon
The name of a 200 sided polygon is dihectagon.
The name of a 600 sided polygon is Hexcosiagon.
there is no such thing as two-sided polygon.