The English base for agricultural areas has been acres, sections (about 1 sq, mi.) or square miles for ranches and large holdings.
Metric farms would be measured in hectares (about 5 acres, or 10,000 m2) or square kilometers (about .36 sq. mi.). Small garden plots might be in m2.
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if you are after a metric measurement than millimetres^2
I would use the metric unit is inches
For just about any type of unit, different units are used between the English system and the SI (metric) system. In both systems, there are units for length, area, volume, mass, force, temperature, etc.
It must be a perimeter. An area measurement would a square measurement like 56cm². ■
centimeter