A 12-sided polygon is called a dodecagon.
See this website for more names:
http://mathforum.org/dr.math/faq/faq.polygon.names.html
a plane figure 12 sides
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A quadrilateral is a closed plane figure with four straight sides.
An 8-sided plane figure is an octagon.
A expample of a plane figure with 6 sides and 6 vertices is called a hexagon. hex means 6.
It is a dodecagon
A polygon