It is a 12 sided shape that can be either regular or irregular
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A regular or an irregular dodecagon both have 12 sides
An irregular dodecagon.
It is a dodecagon. While it is irregular, so is a dodecagon with equal sides but unequal angles, so "irregular" is not enough.
A regular 12 sided dodecagon has 54 diagonals.
The shape of the twelfth figure is a dodecagon. A dodecagon is a polygon with twelve sides and twelve angles. It is a regular dodecagon if all its sides and angles are equal. The interior angles of a regular dodecagon measure 150 degrees each.