metres
centimeter
no, Acres is an Imperial Unit for the measure of area. The metric unit for area is the square meter.
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.
Metres, to measure its length or width, square metres to measure its area.
if you are after a metric measurement than millimetres^2
in feet
metric unit
I would use the metric unit is inches
square meter (m2)
kilograms
Square centimetres: unless I was in production in which case square millimetres.
A microgram.