Calculate the volume of a cube

The volume is how much space the cube takes up. The side length $a$ is the length of one of the cube's edges, and in a cube all edges are the same length.

The formula is:

$$V = a^3$$

You multiply the side length by itself three times: $a \cdot a \cdot a$. It is the same idea as the rectangle's area, just in three directions: the cube's length, width and height are all $a$.