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The amount (flux) of light incident at a distance of 1 foot from a standard candle.
the 'foot' measurement was derived from the length of the human foot. The word ''inch' was adopted from the Latin word 'unica' meaning a 12th part. The early English, having no measurement of their own adopted the 'unica' from 'unus' meaning one
As a new measurement, they measured King Henry's (I Think) foot. This is known as a "ruler"
Measuring "area" refers to determining size in two dimensions (e.g., length and width). The resulting measure is typically reported in terms of units of measurement "squared." For example, if a surface is one foot long and one foot wide, the area of the surface is called "one square foot" or "one foot squared."
a king invented it :)