Square kilometres.
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You could use square kilometers (km²) or square miles (mi²) to measure the area of Britain.
Metres, to measure its length or width, square metres to measure its area.
Any unit of area, such as square meters, hectares, square kilometers, etc.
First you need to decide what PROPERTY of the ear you want to measure: its length, its area, its mass, its surface area, etc.
Square feet is a common unit used to measure the area of a room in a house. It provides a good measure of the total floor space available within the room.
A square meter of water would not be measured in gallons, as gallons are a measure of volume, while square meters are a measure of area. It would depend on the depth of the water in the square meter area to calculate the volume in gallons.