You measure a great number of them, keeping records of every measurement,
and then you calculate the average of all of the measurements.
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It depends on what you mean by size: its length, volume, surface area or even its mass.
Length and width define two dimensions, like a piece of paper has a length distance measure along one side and a width distance measure on the other side. In three dimensions there is length and width and height, like a solid brick or block
No. A centimeter is a measure of length. Any unit of measure that has a meter in it is a measure of length. For example, millimeters, meters, kilometers are all units of measure for length.
there are many instruments used to measure length . measuring tape is used to measure the length of room.
it measures length.