Asquare garden has an area of 182 square feet about how many feet of fencing do u need

 about 54 ft."  .

Explanation:

A = L * w ; 

A square is a rectangle that has all equation sides; 

so; for a square.  (L = w).

or, "A = s² " ; in which "s" in the length of any one side.
 
Since "A = s² "

And "A = 182 ft² " ;

we need to solve for "s" ;

and then find the perimeter of the square with is:  "4*s" .

  A = s² ;   ↔ s² = A ;   s² = 182 ft² ;  

                Take positive square root of each side of the equation; to isolate "s" on one side of the equation ; and to solve for "s" ;

  √(s²) =  √(182 ft²)  ;

to get:  s = √182  ft, = 53.9629502529281659 ft.
  
The perimeter:  4* s = 4√(182 ft) =  4* (13.4907375632320415 ft.) ;
 
                                                   = 53.9629502529281659 ft. 
 
                                                round to 54 ft.