If I understood the question correctly, the answer would be 400
The absolute difference between the largest and smallest possible measures of the area of a square lot with a measurement error of 1% on each side is 400 square feet. ;
The absolute difference between the largest and smallest possible measures of the area of the square lot is 400 square feet. The smallest possible area is 9801 square feet, while the largest possible area is 10,201 square feet. This difference arises due to a 1% measurement error in each side length.
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