81mm x 104mm x 140mm = 1179360 square mm or 1828 square inches
It differs from 1mm to over 30mm
81mm is more ie 81mm=8.1cm
81mm
8.1cm (divide mm by 10 to get cm)
C7 envelopes are 81mm x 114mm.
If the questions is referring to the tube, then only one.
Typically, 38-40.
If the area is 81 millimeters, the side length is the square root of that, or 9 millimeters.
Five feet six inches !
it is about 46 inches
36 inches