In density, composition and size. None of them look the same.
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There are different numbers on the different platonic solids.
There are different formulae for different solids such as spheres or polyhedra.
I live in a solid. I am sitting on a solid and am wearing solids. My eyesight is helped by solids as my fingers tap on different solids and I monitor the results on another solid. That should be enough to get you started.
Some semi-solids might, but a solid, by definition keeps it's original shape.
The Platonic solids were name after the Greek philosopher Plato, who theorized that the classical elements were constructed from the regular solids.