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  2. Acre - Wikipedia

    en.wikipedia.org/wiki/Acre

    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.

  3. Area - Wikipedia

    en.wikipedia.org/wiki/Area

    The acre is also commonly used to measure land areas, where 1 acre = 4,840 square yards = 43,560 square feet. An acre is approximately 40% of a hectare. On the atomic scale, area is measured in units of barns, such that: [13] 1 barn = 10 −28 square meters. The barn is commonly used in describing the cross-sectional area of interaction in ...

  4. 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 ...

  5. List of countries and dependencies by area - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_and...

    Dymaxion map of the world with the 30 largest countries and territories by area. This is a list of the world's countries and their dependencies, ranked by total area, including land and water.

  6. Rod (unit) - Wikipedia

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

    The rod is useful as a unit of length because integer multiples of it can form one acre of square measure (area). The 'perfect acre' [2] is a rectangular area of 43,560 square feet, bounded by sides 660 feet (a furlong) long and 66 feet (a chain) wide (220 yards by 22 yards) or, equivalently, 40 rods by 4 rods. An acre is therefore 160 square ...

  7. Perimeter - Wikipedia

    en.wikipedia.org/wiki/Perimeter

    A perimeter is a closed path that encompasses, surrounds, or outlines either a two dimensional shape or a one-dimensional length. The perimeter of a circle or an ellipse is called its circumference. Calculating the perimeter has several practical applications. A calculated perimeter is the length of fence required to surround a yard or garden.

  8. Square mile - Wikipedia

    en.wikipedia.org/wiki/Square_mile

    Square miles should not be confused with miles square, a square region with each side having a length of the value given. For example, a region which is 20 miles square (20 miles × 20 miles) has an area of 400 sq mi; a rectangle of measuring 10 miles × 40 miles also has an area of 400 sq mi, but is not 20 miles square.

  9. Cent (area) - Wikipedia

    en.wikipedia.org/wiki/Cent_(area)

    One cent is defined as an area of 1 ⁄ 100 of an acre (40.5 m 2; 435.6 sq ft). It is still used in many news reports [1] and real estate deals. [2] Conversion chart