The official SI unit is square meters, but the square of any other linear unit can be used as well, for example, square millimeters, square kilometers, square light-years, square parsecs, etc.
This depends on what unit you are using to measure in. However, area will always be measure in (unit)^2.
no, Acres is an Imperial Unit for the measure of area. The metric unit for area is the square meter.
A unit can be a measure of length. It is one-dimensional. A squared unit can be a measure of area. It is two-dimensional. A cubic unit can be a measure of volume. It is three-dimensional.
A square unit is a measure of area, a foot is a linear unit. There are no area units in any linear measure.
area, acre
It is the area.
They are used to measure quantities that are not basic. Length, for example, is a basic unit, but area and volume are not so derived units will be used to measure area and volume.
Square feet is a good unit to measure the area of a room in a house.
You could measure a small area.
you divide or multiply
Cubic kilometres.
In the context of length, a unit is a measure of distance, whereas a square unit is a measure of area.