If you have a rectangle, measure the length and width of your surface in millimeters and multiply the values. This gives you the area in square millimeters. If you know the area in square meters, multiply by one million (1 000 000) to get square millimeters.
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105 x 57 mm = 5,985 square millimetres 5,985 square millimetres (mm) = 598.5 square centimetres (cm)
2052 square millimetres.
1 sq. cm = 100 sq. mm.
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.
Square millimetres.