<h3>
Part I: Recalling the surface area formula</h3>
The surface area of a 3D figure is the sum of the area of its faces.
<u>We know the following:</u>
- As this shape is a cube, all faces of a cube must be a square.
- The area of a square is known as (side)².
- All faces in a cube must have the same area
- There are 6 faces in a cube
Since all faces in a cube have the same area, the surface area of a cube is:
Therefore, the surface area of a cube must be known as 6(side)².
<h3>Part II: Determining the surface area of the cube</h3>
Substitute the side length in the surface area formula and simplify:
Therefore, the surface area of the cube is 216 cm².
Learn more about surface areas of cubes: brainly.com/question/26941141