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2. Acre - Wikipedia

   en.wikipedia.org/wiki/Acre

   The acre is related to the square mile, with 640 acres making up one square mile. One mile is 5280 feet (1760 yards). In western Canada and the western United States, divisions of land area were typically based on the square mile, and fractions thereof. If the square mile is divided into quarters, each quarter has a side length of 1 ⁄ 2 mile ...

3. Surface area - Wikipedia

   en.wikipedia.org/wiki/Surface_area

   A sphere of radius r has surface area 4πr 2.. The surface area (symbol A) of a solid object is a measure of the total area that the surface of the object occupies. [1] The mathematical definition of surface area in the presence of curved surfaces is considerably more involved than the definition of arc length of one-dimensional curves, or of the surface area for polyhedra (i.e., objects with ...

4. Morgen - Wikipedia

   en.wikipedia.org/wiki/Morgen

   A morgen was a unit of measurement of land area in Germany, the Netherlands, Poland, Lithuania and parts of the Dutch Overseas Empire, such as South Africa.The size of a morgen varies from 1 ⁄ 2 to 2 + 1 ⁄ 2 acres (2,000 to 10,100 m 2).

5. Section (United States land surveying) - Wikipedia

   en.wikipedia.org/wiki/Section_(United_States...

   One of the reasons for creating sections of 640 acres (260 ha) was the ease of dividing into halves and quarters while still maintaining a whole number of acres. A section can be halved seven times in this way, down to a 5-acre (2 ha) parcel, or half of a quarter-quarter-quarter section—an easily surveyed 50-square-chain (2 ha) area. This ...

6. Area - Wikipedia

   en.wikipedia.org/wiki/Area

   That is, the area of the rectangle is the length multiplied by the width. As a special case, as l = w in the case of a square, the area of a square with side length s is given by the formula: [1] [2] A = s 2 (square). The formula for the area of a rectangle follows directly from the basic properties of area, and is sometimes taken as a ...

7. Conversion of units - Wikipedia

   en.wikipedia.org/wiki/Conversion_of_units

   As can be seen, when the dimensional units appearing in the numerator and denominator of the equation's right hand side are cancelled out, both sides of the equation have the same dimensional units. Dimensional analysis can be used as a tool to construct equations that relate non-associated physico-chemical properties.