A nine-sided regular polygon is called a nonagon or an enneagon. The word nonagon is a hybrid-word where the prefix non- derives from Latin while the suffix -gon derives from Greek.
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icosihenagon= 21-sided polygon icosihenagon= 21-sided polygon
The constructed polygon name for a 24-sided regular polygon is an icosikaitetragon.
a polygon with 12 sides is called a.. dodecagon
The name of a 8 sided polygon is Octagon.
A 10-sided polygon is called a decagon.