To find the surface area of a cube, we use the formula:
\[ \text{Surface Area} = 6a^2 \]
where \( a \) is the length of a side of the cube.
Given that the length of a side of the cube is \( 5 \) cm, we can substitute this value into the formula:
\[ \text{Surface Area} = 6 \times (5 , \text{cm})^2 \]
Calculating \( (5 , \text{cm})^2 \):
\[ (5 , \text{cm})^2 = 25 , \text{cm}^2 \]
Now substitute back into the formula:
\[ \text{Surface Area} = 6 \times 25 , \text{cm}^2 = 150 , \text{cm}^2 \]
So, the surface area of the cube is \( 150 , \text{cm}^2 \).