There are many shapes that have 12 sides. For example:
A pyramid with a hendecagon (-sided) base;
a decagonal prism;
a hexagonal dipyramid;
a dodecahedron, and many other shapes.
Without information about what the shape is, and the lengths of its sides, it is impossible to even attempt to answer the question.
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Volume = 1.6*1.6*1.6 = 4.096 cubic cm
There is no such thing as a two-sided object.
the Greeks used prefexes up to ten, modernly we have sdded dodecagon for a twelvesided object and undecagon for an eleven sided object so the propor name would be a 27 sided object.
An octogon
A hexagon