How many pairs of mutually perpendicular faces does a cube have?

First, let’s take a look at what a cube is and where its face is. A cube is a geometric figure, a rectangular parallelepiped, in which all three dimensions are equal (length = height = width). The faces of a cube are the squares that make up the cube. Looking from each side, we see a square. There are six such squares, so a square has 6 faces in total (see the definition above).