The surface area \( A \) of a cube is calculated using the formula:
\[ A = 6s^2 \]
where \( s \) is the length of one side of the cube.
Given that the sides measure 11 meters, we can substitute \( s \) with 11:
\[ A = 6 \times (11^2) \]
Calculating \( 11^2 \):
\[ 11^2 = 121 \]
Now, substituting back into the formula:
\[ A = 6 \times 121 = 726 , \text{m}^2 \]
Thus, the surface area of the cube is 726 m².