Find the area of the entire surface of a cube if the length of its edge is 8 dm2.

First, we find the area of one surface of the cube. Since this is a cube, all of its edges are equal. Therefore, the area can be calculated as follows. We write down the solution.
S1 = a ^ 2 = (8 dm) ^ 2 = 64 dm ^ 2.
Next, we find the area of the entire surface of the cube, that is, multiply by 6. We get the following.
S 2 = 6 S1 = 6 × 64 = 384 dm ^ 2.
This means that the area of the entire surface of the cube is 384 dm ^ 2.
Answer: the area of the entire surface of the cube is 384 dm ^ 2.