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All you need is a graduated ruler to measure the length of one edge. From there one calculates the volume. For a cube, which has edges of equal length, you can find the the volume by cubing the length of an edge. Vcube = e3
All sides (edges) of a cube are of equal lengths. And because of symmetry, any face of the cube can end up as the base. So it is sufficient if we find the area of any one face which would be the (length of any one edge) multiplied by itself. Hence it is (length of any one edge) x (length of any one edge)
The volume of a cube is determined by cubing the length of one edge, so the cube root of the volume will give you the length of an edge. (In a cube, all of the edges are the same length)
If all three sides are equal in length, the triangle is said to be Equilateral.
They can be. A regular octagon has all sides of equal length.