3 to 20 side of polygon

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For polygons with 3 through 20 sides, simply?add "gon" to the prefixes at the left?(although a trigon is more commonly called a triangle and a tetragon, a quadrilateral!).
WHAT IS a 20 sided polygon called?
Answer:
icosagon

In geometry, an icosagon or 20-gon is a twenty-sided polygon. The sum of any icosagon's interior angles is 3240 degrees.
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