Final answer:
The best estimate of the length of one side of the square patio is 6.16 feet.
Step-by-step explanation:
To find the length of one side of a square patio, you need to calculate the square root of the area. In this case, the area of the square patio is 38 square feet. Taking the square root of 38 gives us approximately 6.16 feet. Therefore, the best estimate of the length of one side of the square patio is 6.16 feet.