yes it sure can. If each side is measured in mm then just trat this the same as with inches and you get area in mm2. However, in baking inches/ cenitmetres are the convention
no
Millimetres.
your finger nail can be measured in millimeters
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.
In USA it is measured in inches, in. In other countries it is measured in millimetres, mm.
In SI units. Depending on the scale, they are measured in kilometres, metres, centimetres, millimetres etc.
The "correct" unit will depend on the order of magnitude of the circle that you are trying to measure. If drawn on a page, the radius is likely to be measured in inches or centimetres. In this case, the area should be given in square inches or square centimetres. But you may want more precision and measure the radius in millimetres and then the area should be in square millimetres. A circle drawn in a field may be measured in feet, yard or metres and its area would then be in square feet, sq yards or sq metres. The radius of the effective reach of a radio beacon may be measured in miles or kilometres and the area would then be in sq miles or sq km.
Wavelength is usually measured in metres or millimetres.
Yes, but millimetres is probably a better unit.
The capacity of a can would not be measured in millimetres, but in millilitres.
A standard sheet of 'everyday' paper is likely to be measured in either millimetres or centimetres. Larger, commercial-sized sheets of paper may, however, be measured in metres.
300,000,000,000,000,000 square millimetres and 299,764,000,000,000,000 square millimetres