How do you find the length of a edge of a cube?

Answer 1

-- If you don't know anything about the cube, then you just have to measure it.

-- If you're told something about the cube, like for example its volume, or the area

of a face, or the total area of all its faces, then you can use the formulas you know

that express the relationship between the volume or area of a cube and the length

of its edges.