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7 mm
Centimeters are commonly used in this case.
The answers depend on the tool with which you measure the width and length: W and L units. Find the smallest unit you can measure with the tool, e units. Then maximum width = W + e/2 units, minimum width = W - e/2 units, maximum length = L + e/2 units, minimum length = L - e/2 units.
We can't tell without the 3rd dimension of the room. The area of the 4 walls is [ two (length x height) + two (width x height) ], so we need to know the length, width, and height. (Of course, we'll also have to subtract out the area of the doors and windows, but that's minor.)
36 feet