Not necessarily.
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It is a regular 12 sided dodecagon
There are 10 sides to a dodecagon and there are 12 sides on a dodecahedron. * * * * * There are, actually 12 sides to a dodecagon, not 10.
A dodecagon has 12 sides.
A dodecagon has 12 sides
It all depends on what kind of polygon it is. It may have no congruent sides or all congruent sides.