Answer:
The correct option will be: (b) 7 feet.
Explanation:
Suppose, the length of the garden is 
 feet.
 feet. 
As the shape of the garden is like a square, then the area of the garden will be: 
 feet²
 feet²
Given that, the area is 52 square feet. So, the equation will be.......

So, the approximate length of the garden will be 7 feet.