Let's assume that the length of each side of the square garden is "x" feet. Since a square has four equal sides, the perimeter of the garden is:
Perimeter = 4x
We know that the landscaper used 48 feet of fencing to create the perimeter, so we can set up an equation:
48 = 4x
Dividing both sides by 4, we get:
x = 12
Therefore, the length of each side of the square garden is 12 feet.
To find the area of the garden, we can use the formula:
Area = length x width
Since the garden is a square, its length and width are equal, so we can write:
Area = x^2
Substituting the value of x, we get:
Area = 12^2 = 144 square feet
Therefore, the landscaper will need to cover 144 square feet of ground with new soil.