Because most people had feet and forearms, that they could measure things with.
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It depends on the units of measurement used for 36x 24 - whether they are feet, metres, cubits, yards or some other esoteric measure.
It was discovered that pi was actually used in building the pyrimads of Giza around 2600-2500BC. The perimter of the pyrimads were 1760 cubits and the height of the pyrimad was 280 cubits. This is a ratio of 2pi. 1760:280 = 2pi. This is the first recognition of pi.
Square feet are used to measure area, while feet are used to measure distance. They are not equivalent, and so cannot be converted from one to another.
No. Square feet can be used to measure area, area is not a measurement itself.
It's the abbreviation of feet or foot used as a unit of measure.