A 30-sided polygon is called a triacontagon. The prefix "tria-" is derived from the Greek word for three, and "contagon" is derived from the Greek word for angle. Therefore, a triacontagon has 30 sides and 30 angles.
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The name of a 7 sided polygon is Heptagon.
A hendecagon or an undecagon is the name of a polygon which has eleven sides.
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A 6 sided polygon is called an hexagon
It is called a heptagon.