To find the area of a square, you can use the formula:
\[ \text{Area} = \text{side} \times \text{side} \]
In this case, the side length 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 or 169 ft squared.