Area of a Square: A = w²
Perimeter of a Square: P = 4w
(You can remove length because, in a square, length and with are the same)
w² = 120
w = √120
w ≈ 11
4w = 44
w = 11
The dimensions are ~10.9544 if you go by area
But they are likely looking for the answer 11, which is gotten from the Perimeter