The simplest shape to calculate the surface area for is the cube. The cube is a shape with a surface area composed of six identical squares. The area of one square is found by taking the length of one side and raising it to the second power (squaring it). For example, a square with sides of 3cm would have an area of 9cm³ because 3² = 9 or 3 x 3 = 9.
Now that we know the area of one of the side of the cube, we can calculate the whole surface area of the cube by multiplying that area of one side by 6, as there are six identical sides to a cube. So for our example, the area of one side was 9cm³ , so for the area of the whole cube we multiply 9cm³ x 6 giving us 54cm³.
So we can express the formula for the surface area of a cube as follows: Cube Surface Area = 6 x L² , where L is the length of one of the sides.