Question 151359
A cube will have length width and height that are the same.

Thus, we need only find the area of one face, then multiply by 6 (there are 6 sides).

So if l=w=h, l*l is the area of any side.

So, 6l^2 will be the formula of the surface area of a cube.

We can just say 6a^2 to avoid ambiguity.