Final answer:
The approximate length of each side of the square is 8 feet.
Step-by-step explanation:
To find the approximate length of each side of the square, we need to find the square root of the area. In this case, the area is 77 square feet. Taking the square root of 77, we get approximately 8.77 feet. Therefore, the approximate length of each side of the square is 8 feet.