The volume of a rectangular solid with those dimensions is 27 cm3.
If we also knew its mass, then we could calculate its density.
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Density = grams/cm^3 (cc) 3 cm^3 = 27 cm^3 Density = 12 grams/27 cm^3 = 0.4 grams/cm^3 ----------------------------
5 g/cm^3.
3cm x 3cm = 9 cm^(2(.
3cm = 30mm.
It is likely that the shape you have in mind is a cube, with each edge being 3 cm long.