How is the precision used in measuring the length and width of a rectangle related to the precision of the resulting area measurement?

The more precise your length and width are, the more precise your area measurement will be. Take this as example:

width = 9.3045 mm

length = 8.023 mm

Let's first round up:

width = 9.3 mm

length = 8 mm

Area = 9.3*8 = 74.4 mm

But if you are more precise with the width and length:

width = 9.3045 mm

length = 8.023 mm

Area = 9.3045 * 8.023 = 74.6500035 mm

The more precise your length and width are, the more precise your area is. Also, as you can see t he more precise your length and width are, the more your area will increase and will be more accurate.