A pentagon would have 5 sides. If it had 12 sides it would not be a pentagon. Maybe you mean a dodecahedron with 12 sides. I don't know what you would call that.
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Dodecagon. A pentagon has five sides, a polygon with 12 sides is a dodecagon. A dodecahedron has 12 regular facets.
Pentagon.
The name of a 5 sided polygon is Pentagon.
If you mean 5 sided polygon... then its a pentagon
A 5-sided figure is called a pentagon.