A "dodeca" is a prefix: it is not a shape. An octahedron has eight faces.
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An octahedron has 8 sides.
Think of the Spanish word "dos" meaning "two." "Deca" is ten. Dodeca is 2 + 10
A trisoctahedron, otherwise known as a Triakis octahedron, has 24 faces.
An octahedron is an eight sided polyhedron. It has eight sides or faces, 12 edges, and six vertexes. Please see the Related Link below for more information and a picture.
It has 12. This solid has 8 sides, each of which is an equilateral triangle (in the case of the regular octahedron). Use the link and surf on over to Wikipedia to see a picture.