Acre

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Published on December 5, 2021 1:59:18 AM ● Video Link: https://www.youtube.com/watch?v=qoYGHIkCWCQ

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Acre, by Wikipedia https://en.wikipedia.org/wiki?curid=1797 / CC BY SA 3.0

#Customary_units_of_measurement_in_the_United_States
#Imperial_units
#Surveying
#Units_of_area
The acre is a unit of land area used in the imperial and US customary systems.
It is traditionally defined as the area of one chain by one furlong （66 by 660 feet）, which is exactly equal to 10 square chains, 1⁄640 of a square mile, 4,840 square yards, or 43,560 square feet, and approximately 4,047 m2, or about 40% of a hectare.
Based upon the International yard and pound agreement of 1959, an acre may be declared as exactly 4,046.
8564224 square metres.
The acre was sometimes abbreviated ac, but was often spelled out as the word "acre".
Traditionally, in the Middle Ages, an acre was conceived of as the area of land that could be ploughed by one man using a team of oxen in one day.
It is still a statute measure in the United States.
Both the international acre and the US survey acre are in use, but they differ by only two parts per million （see below）.
The most common use of the acre is to measure tracts of land.
The acre is commonly used in a number of current and former British Commonwealth countries by custom only.
In a few it continues as a statute measure, although since 2010 not in the UK itself, and not since decades ago in Australia, New Zealand and South Africa.
In many of those where it is not a statute measure, it is still lawful to "use for trade" if given as supplementary information and is not used for land registration.
One acre equals 1⁄640 （0.0015625） square mile, 4,840 square yards, 43,560 square feet, or about 4,047 square metres （0.4047 hectares） （see below）.
While all modern variants of the acre contain 4,840 square yards, there are alternative definitions of a yard, so the exact size of an acre depends upon the particular yard on which it is based.
Originally, an acre was understood as a selion of land sized at forty perches （660 ft, or 1 furlong） long and four perches （66 ft）...