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Knowledge of the metric system for linear and square measure would perhaps, as an introduction to decimal fractions, more than save the time spent to learn it.

We may add this is better than selling by square measure.

For conclusions regarding linear and square measures, cf.

The unit adopted for square measure was the are, equal to 100 square meters; for solid measure, the stère, equal to one cubic meter; and for measure of capacity, the litre, a cubic decimeter.

The "square measure," upon which the coinage, if I may so call it is based, following exactly the measure of length, each larger area in the ascending scale represents 144 times that below it.