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A 3-d shape with 12 faces is a dodecahedron. It can come in may configurations:

A pyramid with a hendecagon (11 -sided) base,

A decagonal prism,

A hexagonal dirpyamid,

A shape formed from penatgons,

A cuboid with six of its vertices sliced off,

and so on.

So the answers to the remainder of the question depend on which shape precisely.

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