The volume of a cube is given by side × side × side cubic units. This can be calculated in four ways, but the most straightforward is: Volume of cube = s³ where s is the length of a side. For example, to find the volume of a cube with a side length of 20 units, you would calculate 20³.

The volume of a three-dimensional shape is a measurement of the space inside the shape and is determined by multiplying the length, width, and height. A cube is a three-dimensional shape in which the length, width, and height are equal. Thus, it is easy to find the volume of a cube given the length of one edge.

Here we will use the equation of the diagonal to derive the formula of volume of a cube with diagonal. Length of Space Diagonal (d) = 3 a — (1) The equation for volume of a cube with edge length is V = a 3, — (2) Now, replacing the value of a in eqn (1) a = d/√3, from (1) V = a 3 = (d/√3) 3 replacing the value of a from (1)

The takeaway from this section is that a cube is a 3D object; hence it has a volume. It's also highly regular, which means it's straightforward to find the volume of a cube. Volume is a measure of the 3D space occupied by an object.