Because the number would be too difficult to write down, remember, and
tell anybody else about.
Would you be able to easily follow driving instructions to your dentist's office, if
you were told to leave the Parkway at Exit 54, turn left, drive 2,174,894 millimeters
west, turn right at the traffic light, and then look for a parking space after proceeding
roughly 3,872,000 millimeters more ?
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In USA it is measured in inches, in. In other countries it is measured in millimetres, mm.
The same as linear distances: kilometres, metres, centimetres, millimetres, etc.
Millimetres and millimetres are the same measurement. Therefore, 200 millimetres is equal to 200 millimetres.
Yes, but millimetres is probably a better unit.
Any non-square unit of length, for example miles, kilometres, millimetres, chains, fathoms, leagues, pounds, kilograms, gallons, degrees. It could be measured in square miles, square kilometres, square millimetres, acres, ares, etc.