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  2. 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 mi × 20 mi) has an area of 400 sq mi; a rectangle of measuring 10 mi × 40 mi also has an area of 400 sq mi, but is not 20 miles square.

  3. Circular mil - Wikipedia

    en.wikipedia.org/wiki/Circular_mil

    In square mils, the area of a circle with a diameter of 1 mil is: = = = = ( ) = . By definition, this area is also equal to 1 circular mil, so: = . The formula for the area of an arbitrary circle in circular mils can be derived by applying this conversion factor to the standard formula for the area of a circle (which gives its result in square mils).

  4. Earth's circumference - Wikipedia

    en.wikipedia.org/wiki/Earth's_circumference

    t. e. Earth's circumference is the distance around Earth. Measured around the equator, it is 40,075.017 km (24,901.461 mi). Measured passing through the poles, the circumference is 40,007.863 km (24,859.734 mi). [1] Measurement of Earth's circumference has been important to navigation since ancient times. The first known scientific measurement ...

  5. Square kilometre - Wikipedia

    en.wikipedia.org/wiki/Square_kilometre

    The square kilometre (square kilometer in American spelling; symbol: km2) is a multiple of the square metre, the SI unit of area or surface area. 1 km 2 is equal to: 1,000,000 square metres (m 2) 100 hectares (ha) It is also approximately equal to: 0.3861 square miles [ 2 ] 247.1 acres [ 3 ] Conversely:

  6. Section (United States land surveying) - Wikipedia

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

    The primary grid pattern is of quarter sections (1⁄2 mi × 1⁄2 mi (800 m × 800 m)). In U.S. land surveying under the Public Land Survey System (PLSS), a section is an area nominally one square mile (2.6 square kilometers), containing 640 acres (260 hectares), with 36 sections making up one survey township on a rectangular grid. [1]

  7. City block - Wikipedia

    en.wikipedia.org/wiki/City_block

    A city block, residential block, urban block, or simply block is a central element of urban planning and urban design. In a city with a grid system, the block is the smallest group of buildings that is surrounded by streets. City blocks are the space for buildings within the street pattern of a city, and form the basic unit of a city's urban ...

  8. Area - Wikipedia

    en.wikipedia.org/wiki/Area

    A square metre quadrat made of PVC pipe. Every unit of length has a corresponding unit of area, namely the area of a square with the given side length. Thus areas can be measured in square metres (m 2), square centimetres (cm 2), square millimetres (mm 2), square kilometres (km 2), square feet (ft 2), square yards (yd 2), square miles (mi 2 ...

  9. Township (United States) - Wikipedia

    en.wikipedia.org/wiki/Township_(United_States)

    A survey township is simply a geographic reference used to define property location for deeds and grants as surveyed and platted by the United States General Land Office (GLO). A survey township is nominally six by six miles square, or 23,040 acres. A civil township is a unit of local government, generally a civil division of a county.