Answer:
13 ft
Step-by-step explanation:
The area of a pool is length × width (l × w) , but the length and width are the same so I'll use [tex]b[/tex] representing both length and width:
A = l × w
A = [tex]b^{2}[/tex]
Area of the pool is 169
169 = [tex]b^{2}[/tex]
[tex]b[/tex] = [tex]\sqrt{169}[/tex]
[tex]b[/tex] = 13
