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Every dodecahedron - not just an average one, has 12 faces. It can have as few as 8 vertices.
When you say "sides", do you mean faces or edges? A dodecahedron has 12 faces and 30 edges.
A dodecahedron is a polyhedron with 12 faces, each of which is a regular pentagon. In a dodecahedron, the faces are not parallel to each other. The planes of the faces intersect at various angles, giving the dodecahedron its unique shape and properties.
a dodecahedron
A Dodecahedron has 12 pentagonal faces.