I am unsure as to what the questions regards as far as measurement goes, but I can say that all aspects relating to the construction and flight of paper airplanes can be measured.
The metric system is used to measure distance in Brazil.
Miles.
meters
Use units of millimeters, meters, or kilometers.
Using the Metric System: meters, kilometers.
kilometre
The metric system is used to measure distance in Brazil.
distance
Miles.
Distance is measured metrically in meters
Meters if you're using the metric system. Otherwise use feet.
'km' is the abbreviation for kilometers; a metric measure of distance.
meters
Use units of millimeters, meters, or kilometers.
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A gram is a measure of mass whereas a metre is a measure of distance.
Kilometers