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12. (deca = 10, octo = 8, hexa = 6 etc)
A "dodeca" is a prefix: it is not a shape. An octahedron has eight faces.
Twelve. Or when describing an object, the prefix "dodeca- " can be used. Examples are dodecahedron, a polygon with 12 sides, or dodecapod - an imaginary animal with 12 legs :-)
Dodeca-, meaning 2+10, is used in describing any 12-sided figure thus dodecagon
Think of the Spanish word "dos" meaning "two." "Deca" is ten. Dodeca is 2 + 10