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One acre equals 1 ⁄ 640 (0.0015625) square mile, 4,840 square yards, 43,560 square feet, [2] 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.
It covers an area of ca. 40,000 square meters (10 acres). Underwater excavations have uncovered remnants of rectangular houses and a well. The site was covered by the eustatic rise of sea levels after the end of the last Ice Age. It is assumed that the contemporary coastline was about 1 km (a half-mile) west of the present coast.
This was standardised to be exactly 40 rods or 10 chains. An acre was the amount of land tillable by one man behind one team of eight oxen in one day. Traditional acres were long and narrow due to the difficulty in turning the plough and the value of river front access. An oxgang was the amount of land tillable by one ox in a ploughing season ...
Since an acre is defined as a chain by a furlong (i.e. 66 ft × 660 ft or 20.12 m × 201.17 m), an acre-foot is 43,560 cubic feet (1,233.5 m 3). There has been two definitions of the acre-foot (differing by about 0.0006%), using either the international foot (0.3048 m) or a U.S. survey foot (exactly 1200 / 3937 meters since
The hectare (/ ˈ h ɛ k t ɛər,-t ɑːr /; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm 2), that is, 10,000 square metres (10,000 m 2), and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An acre is about 0.405 hectares and one hectare contains about ...
The unit is still in use in many areas previously ruled by the Ottomans, although the new or metric dunam has been redefined as exactly one decare (1,000 square metres (11,000 sq ft)), which is 1/10 hectare (1/10 × 10,000 square metres (110,000 sq ft)), like the modern Greek royal stremma.
dunam (metric dunam) Q23931109 (none) The spellings dunum, donum and dönüm are also acceptable variants. Just replace dunam with the desired spelling in the code. The spelling dönüm also results from using donum diaeresis or donum dots. 1.0 dunam (0.0010 km 2; 0.00039 sq mi) Japanese: tsubo: tsubo Q23931147 (none) 1.0 tsubo (3.3 m 2) Korean ...
List of orders of magnitude for areas 10 15 to 10 26 square metres. Factor (m 2) Multiple Value Item 10 15: 1 peta square meter P(m 2) 1,000 Mm 2: Surface area of the white dwarf, Van Maanen's star: 7,600 Mm 2: Surface area of Neptune [91] 10 16 43,000 Mm 2: Surface area of Saturn [92] 61 000 Mm 2