It's called a heptagon.
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A seven sided figure is heptagon I hoped i helped
An 8-sided plane figure is an octagon.
heptagon.
A three sided closed plane figure (shape) is a triangle.
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