To find the area of a square, you use the formula:
\[ \text{Area} = \text{side} \times \text{side} \]
In this case, each side of the square is 13 feet:
\[ \text{Area} = 13 , \text{ft} \times 13 , \text{ft} = 169 , \text{ft}^2 \]
So the area of the square is 169 ft.².