A 38-sided polygon is called a triacontakaioctagon. The naming convention for polygons follows the Greek numerical prefixes for the number of sides, in this case "tri" for 3 and "contakai" for 10, along with the suffix "-gon" for polygon. Therefore, a 38-sided polygon is a triacontakaioctagon.
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A five sided polygon is called a pentagon because pentagon means five sided polygon I think.
A 12-sided polygon is called a dodecagon.
A 20-sided polygon is called an icosagon.
A million-sided polygon is called a megagon.
A 90-sided polygon is called an enneacontagon.