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  2. Acre - Wikipedia

    en.wikipedia.org/wiki/Acre

    The acre (/ ˈ eɪ k ər / AY-kər) is a unit of land area used in the British imperial and the United States 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 ...

  3. Hectare - Wikipedia

    en.wikipedia.org/wiki/Hectare

    Image comparing the hectare (the small blue area at lower left) to other units. The entire yellow square is one square mile.. 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.

  4. Public Land Survey System - Wikipedia

    en.wikipedia.org/wiki/Public_Land_Survey_System

    The Public Land Survey System (PLSS) is the surveying method developed and used in the United States to plat, or divide, real property for sale and settling. Also known as the Rectangular Survey System, it was created by the Land Ordinance of 1785 to survey land ceded to the United States by the Treaty of Paris in 1783, following the end of the ...

  5. United States customary units - Wikipedia

    en.wikipedia.org/wiki/United_States_customary_units

    The metric system also lacks a parallel measurement to the foot. [10] ... The most widely used area unit with a name unrelated to any length unit is the acre.

  6. Rood (unit) - Wikipedia

    en.wikipedia.org/wiki/Rood_(unit)

    Comparison of 1 rood (unit) with some Imperial and metric units of area Rood is an English unit of area equal to one quarter of an acre [ 2 ] or 10,890 square feet, exactly 1,011.7141056 m 2 . A rectangle that is one furlong (i.e., 10 chains , or 40 rods) in length and one rod in width is one rood in area, as is any space comprising 40 perches ...

  7. Acre-foot - Wikipedia

    en.wikipedia.org/wiki/Acre-foot

    The acre-foot is a non-SI unit of volume equal to about 1,233 m 3 commonly used in the United States ... the metric system is in common use and water volumes are ...

  8. Weights and Measures Act (Canada) - Wikipedia

    en.wikipedia.org/wiki/Weights_and_Measures_Act...

    unit name official definition metric equivalent English French square mile mille carré: 640 acres 2.589988110336 km 2: acre: acre: 4,840 sq yd 4,046.856422 m 2: square rod perche carrée: 30 + 1 ⁄ 4 sq yd 25.29285264 m 2: square yard yard carré or verge carrée: a superficial area equal to that of a square each side of which measures one ...

  9. List of metric units - Wikipedia

    en.wikipedia.org/wiki/List_of_metric_units

    Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. According to Schadow and McDonald, [ 1 ] metric units, in general, are those units "defined 'in the spirit' of the metric system, that emerged in late 18th century France and was rapidly adopted by scientists and engineers.