As far as I can see I would say exactly zero.
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Eight inches rounded to the nearest half inch is still eight inches.
Eight inches is a measurement of length whereas a cup is a measurement of volume. They are two completely different types of measurement.
Area of a rectangle = length x width Area = 9 m x 8 m Area = 72 m2 = 72 square metres
They will be both the same because the perimeter of the square is 32 units and the perimeter of the rectangle is also 32 units
You can`t be sure of the individual sides. A one inch by sixteen inch rectangle, an eight by two inch rectangle, a four inch by four inch rectangle all have the same area (16 square inches) but the first rectangle`s sides add up to 34, the second rectangle`s sides add up to 20, the third rectangle`s sides add up to 16