We need to measure length or distance because they're both physical dimensions necessary in every-day life. For example - you cannot calculate how much fuel you would need to drive from A to B, without knowing how far B is from A ! Another example - you wouldn't know if a piece of furniture would fit in a space you have - without measuring the dimensions of height, width and length !
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It is a measure of length or distance.
Distance or circumfrence.
Length is usually a measure of distance in a straight line. Girth is the distance around a [solid] object.
You cannot. Kilograms are a measure of mass, yards are a measure of length or distance.
By unit of length and distance and conversion ,we can say that cm is used to measure length of a finger