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acre : ウィキペディア英語版
acre

The acre is a unit of land area used in the imperial and US customary systems. It is defined as the area of 1 chain (22 yards) by 1 furlong (220 yards), which is exactly equal to of a square mile, 43,560 square feet, approximately 4,046.856 m2, or about 40% of a hectare.
The acre is commonly used in Antigua and Barbuda〔(【引用サイトリンク】title=Gov’t Gifts ‘Bakka’ With Half-Acre Land | Antigua Observer Newspaper )American Samoa,〔(【引用サイトリンク】title=National Park of American Samoa completes two successful forest projects | Samoa News )The Bahamas,〔(【引用サイトリンク】title=The Nassau Guardian )Belize,〔(【引用サイトリンク】title=2,225-acre Cobia farm proposed near Lark and Bugle Cayes | Amandala Newspaper )〕 the British Virgin Islands,〔(【引用サイトリンク】title=Work continues on development )〕 the Cayman Islands,〔(【引用サイトリンク】title=Kai drama over 50-acre development :: cayCompass.com )Dominica,〔(【引用サイトリンク】title=Dominica not meeting quota for international banana markets | Dominica News Online )〕 the Falkland Islands,〔(【引用サイトリンク】title=Farm Yarns with Elaine - Farm yarns with Elaine Turner - Part 13 )Grenada,〔(【引用サイトリンク】title=Grenada Broadcast - George Grant - THE GRENADA SPICES INDUSTRY )Guam,〔(【引用サイトリンク】title=Local News | Pacific Daily News | guampdn.com )〕 the Northern Mariana Islands,〔(【引用サイトリンク】title=Saipan Tribune. )India, Ireland, Jamaica,〔http://supremecourt.gov.jm/sites/default/files/judgments/Tropicrop%20Mushrooms%20Ltd%20v%20Saint%20Thomas%20Parish%20Council%2C%20etal.pdf〕 Montserrat,〔(【引用サイトリンク】title=Beresford Allen of St. Peters Montserrat is a Wanted Man! | The Montserrat Reporter )Myanmar, Pakistan, Samoa,〔(【引用サイトリンク】title=Conflicting stories about Nu’u estate )St. Lucia,〔(【引用サイトリンク】title=The Voice - The national newspaper of St. Lucia since 1885 )St. Helena,〔(【引用サイトリンク】title=FEATURE: We built an island dream on our own St Helena | St Helena Online )St. Kitts and Nevis,〔(【引用サイトリンク】title=SIDF Sinks SKN Passport Money into Christophe Harbour :: The St. Kitts-Nevis Observer )St. Vincent and the Grenadines,〔(【引用サイトリンク】title=PM vows to spend rest of life seeking reparations – I-Witness News )Turks and Caicos,〔(【引用サイトリンク】title=Government gets $8million from Emerald Cay sale )〕 the United Kingdom, the United States and the US Virgin Islands.〔(【引用サイトリンク】title=Proposed dolphin facility will enclose about 2 acres of Water Bay - News - Virgin Islands Daily News )
The international symbol of the acre is ac. The most commonly used acre today is the international acre. In the United States both the international acre and the slightly different US survey acre are in use. The most common use of the acre is to measure tracts of land. One international acre is defined as exactly  square metres.
An acre was defined in the Middle Ages, being the amount of land that could be ploughed in one day with a yoke of oxen.
==Description==
One acre equals 0.0015625 square miles, 4,840 square yards, 43,560 square feet〔National Institute of Standards and Technology ((n.d.) General Tables of Units of Measurement )〕 or about (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 on which yard 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) wide; this may have also been understood as an approximation of the amount of land a yoke of oxen could plough in one day. A square enclosing one acre is approximately 69.57 yards, or on a side. As a unit of measure, an acre has no prescribed shape; any area of 43,560 square feet is an acre.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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