There's no such thing as the "formula for a cube".
There are formulae for the surface area, the volume, and the length of the cube's sides,
in terms of each other. There are also formulae for the number of edges, the number of
vertices, and the number of faces of a cube, in terms of its definition.
That's at least six different formulae that come along with a cube.
Which quantity are you looking for ?
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Well its quite easy: Density=Mass/Volume Volume=Mass/Density SO if mass and density of a cube are given you can easily find its volume.
If 'S' = length of the cube's side, then its volume = S3 .
The volume of a cube is given by side3, so given the volume take its cube root; thus: volume = 1280 = side3 ⇒ side = 3√1280 units.
Volume=lbh in a cube,l=b=h therefore,volume=a^3
The side length is the cube root of the volume.