I would suggest centimeters but lots of people use inches.
You would multiply the length by the width.
It depends on what you are measuring the width of. Different units and different tools would be appropriate for a hair, a car or a galaxy.
Yards if you work in imperial units or metres if you work in metric units
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It depends on what is being measured. The instruments and units used for measuring the length, width and height of a building would be different to those used for a matchbox!
There is insufficient information to provide a unique answer. Assuming that the length is greater than the width, the length, L, can be any measure from 5 to just under 10 units. The width would then be 10-L units.
METERS!!!The unit of measurement you would use to measure the width of your classroom is meters.
It could be rectangle that has a length of 6 units and a width of 2 units.
This is not a valid conversion. Cubic units is a measure of volume while square units is a measure of area. Generally, volume is determined by multiplying length x width x depth. Area is normally determined by multiplying length x width.
Half the width of your finger.
To calculate capacity, you need the length, height, and width of your tank
Centimetre.