Answer:
The length of the side of the square is 17 ft.

Step-by-step explanation:
The Area of a square can be calculated using the formula;

Given that the area of the square is 289 sq ft, we can calculate the length of the sides by substituting the value of area A into the formula and solve for l;
![\begin{gathered} A=l^2 \\ 289=l^2 \\ \text{square root both sides;} \\ l=\sqrt[]{289} \\ l=17 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/8h314v3fs0ishda8unos50aordv84wucx0.png)
Therefore, the length of the side of the square is 17 ft.
