Usually, the square of a unit of length - for example, the SI unit for area is the square meter, but you can use the square of any other unit of length, for instance, square Planck lengths, or square light-years.There are also units that are specifically used for areas, such as acres, or barns.
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square 3
units with perimeter square units with area
You can convert units of length to units of length, and units of area to units of area. But it doesn't make sense to convert between units of length and units of area.
The area is 2 units squared.
Square units are used to measure the area of something.