It is a dodecagon. While it is irregular, so is a dodecagon with equal sides but unequal angles, so "irregular" is not enough.
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It has 12 sides. This type of polygon is called a dodecagon
A polygon of 12 sides is a 'Dodecagon'.
a 12 sided figure is called a dodecagon
It will have 12 sides
If it is a regular polygon then it will have 360/12 equals 30 sides