A 7 sided shape is an heptagon and sometimes known as a septagon
A 12-sided shape is called a dodecagon.
A 12 sided polygon is called a dodecagon.
A 12 sided figure is called a dodecagon.
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Not sure about a five sided shap, but a five sided plane shape is called a pentagon.
An 8 sided shape is called an octagon
Undecagon
A heptagon
A nonagon has 9 sides
A pentagon or an irregular pentagon if the sides are unequal in length.
Yes.
A 7 sided shape is an heptagon and sometimes known as a septagon
a 9 sided shape is a nonagon
A 12-sided polygon is called a dodecagon.
A 12-sided figure is called a dodecagon.
A 12 sided 3D shape is called a dodecahedron.