Answer :
[tex]\textit{area of a square}\\\\ A=s^2~~ \begin{cases} s=\stackrel{side's}{length}\\[-0.5em] \hrulefill\\ A=\stackrel{ft^2}{81} \end{cases}\implies 81=s^2\implies \sqrt{81}=s\implies 9=s[/tex]
Answer:
9 ft
Step-by-step explanation:
area of a square = side length × side length = (side length)²
Given:
- area of square = 81 ft²
- side length = x
⇒ 81 = x²
⇒ x = √81
⇒ x = 9 ft