Find the surface area of a cube whose edge is 5 m long.

Let’s calculate the surface area of a cube, the edge of which is 5 m long. To find the surface area of a cube, we first determine the area of one side of the cube.
Since this is a cube, all sides are equal, therefore, the area of one side is equal.
S = a ^ 2 = 5m × 5m = 25m ^ 2.
Further, the cube has 6 sides, which means we find the area of the entire surface, for this we multiply the area of one side by 6.
S1 = 6 × S = 6 × 25 m ^ 2 = 150 m ^ 2.
This means that the area of the entire surface of the cube is 150 m ^ 2.
Answer: S1 = 150 m ^ 2.