The area of a square can be found with the following formula:
[tex]A=s^2[/tex]
Where "s" is the length of any asi of the square.
In this case, you can identify that:
[tex]s=3\operatorname{cm}[/tex]
Knowing the value of "s", you can substitute it into the formula:
[tex]A=(3\operatorname{cm})^2[/tex]
Finally, evaluating, you get that the area of each face of the given cube, is:
[tex]A=9\operatorname{cm}^2[/tex]
