US survey acre

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  Square mile

  The square mile (sometimes written as mi²) is an imperial and US unit of measure for an area equal to the area of a square of one statute mile. It should not be confused with miles square, which refers to the number of miles on each side squared. For instance, 20 miles square (20×20 miles) is equal...
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  Square meter

  The square metre (also spelled square meter, see spelling differences) is the SI derived unit of area, with symbol m(33A1 in Unicode). It is defined as the area of a square whose sides measure exactly one metre. The square metre is derived from the SI base unit of the metre, which in turn is...

• Barn

  A barn (symbol b) is a unit of area. Originally used in nuclear physics for expressing the cross sectional area of nuclei and nuclear reactions, today it is used in all fields of high energy physics to express the cross sections of any scattering process. A barn is defined as being 10 m, and...

• Hectare

  A hectare (symbol ha, pronounced /ˈhɛktɛər/) is a unit of area equal to 10,000 square metres (107,639 sq ft), or one square hectometre (100 metres, squared), and is commonly used for measuring land area. The hectare is used in most countries around the world, especially in domains concerned with...

• Acre

  The acre is a unit of area in a number of different systems, including the imperial and U.S. customary systems. The most commonly used acres today are the international acre and, in the United States, the survey acre. One international acre is equal to 4,046.8564224 m. One U.S. survey acre is equal...

• Square kilometer

  Square kilometre (U.S. spelling: square kilometer), symbol km, is a decimal multiple of the SI unit of surface area, the square metre, one of the SI derived units. 1 km is equal to: Conversely: Note: "km" means (km), square kilometre or kilometre squared, and not k(m), kilo–square metre. For...

• Square yard

  The square yard is an imperial/US customary (non-metric) unit of area, formerly used in most of the English-speaking world but now generally replaced by the square metre outside of the US. It is defined as the area of a square with sides of one yard (three feet, thirty-six inches, 0.9144 metres) in...