if you are after a metric measurement than millimetres^2
You would use area. I would use the meter2. Okay
This depends on what unit you are using to measure in. However, area will always be measure in (unit)^2.
centimeter
Square kilometres.
square yards
A metric gram would be precise enough of a measurement for a stamp.
millimetres.
To measure the width of a stamp, you would typically use millimeters (mm) as the metric unit. Stamps are generally small, and millimeters provide a more precise measurement than centimeters or meters. For example, a standard postage stamp might measure around 25 mm in width.
Cubic kilometres.
You would use area. I would use the meter2. Okay
This depends on what unit you are using to measure in. However, area will always be measure in (unit)^2.
The metric unit of the meter would be the appropriate measure of the area of classroom. Calculating area involves multiplying the length (in meters) of the classroom's length and width. Area of the classroom would be in square (^2) meters.
Square feet. ************************* I would use centimetres to give the area in square centimetres.
square inches
metres
centimeter
Square metre.