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  2. The spider and the fly problem - Wikipedia

    en.wikipedia.org/wiki/The_spider_and_the_fly_problem

    In the typical version of the puzzle, an otherwise empty cuboid room 30 feet long, 12 feet wide and 12 feet high contains a spider and a fly. The spider is 1 foot below the ceiling and horizontally centred on one 12′×12′ wall. The fly is 1 foot above the floor and horizontally centred on the opposite wall.

  3. Stadiametric rangefinding - Wikipedia

    en.wikipedia.org/wiki/Stadiametric_rangefinding

    The approximate range of an object one foot (30.48 cm) in height covering roughly 100 milliradians is 10 feet (3.048 m) or: Range (r) = approximate height of object (h) × (1000 ÷ aperture in milliradians (a)) r = h(1000/a) → where r and h are identical units, and a is in milliradians.

  4. Fathom - Wikipedia

    en.wikipedia.org/wiki/Fathom

    Until early in the 20th century, it was the unit used to measure the depth of mines (mineral extraction) in the United Kingdom. [30] Miners also use it as a unit of area equal to 6 feet square (3.34 m 2) in the plane of a vein. [2] In Britain, it can mean the quantity of wood in a pile of any length measuring 6 feet (1.8 m) square in cross ...

  5. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    12 metersheight of the Newby-McMahon Building, the world's littlest skyscraper; 23 metersheight of Luxor Obelisk, located in the Place de la Concorde, Paris, France; 25 meters – wavelength of the broadcast radio shortwave band at 12 MHz; 29 metersheight of the Savudrija Lighthouse; 30 metersheight of Christ the Redeemer

  6. Ancient Greek units of measurement - Wikipedia

    en.wikipedia.org/wiki/Ancient_Greek_units_of...

    0.095 m 2 (1.02 sq ft) square foot hexapodēs ἑξαπόδης: 36 podes 3.42 m 2 (36.8 sq ft) square six-foot akaina ἄκαινα: 100 podes 9.50 m 2 (102.3 sq ft) rod hēmiektos ἡμίεκτος: 833 + 1 ⁄ 3 podes 79.2 m 2 (853 sq ft) half a sixth hektos ἕκτος: 1,666 + 2 ⁄ 3 podes 158.3 m 2 (1,704 sq ft) a sixth of a plethron ...

  7. Foot (unit) - Wikipedia

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

    The foot is legally recognized in the United Kingdom; road distance signs must use imperial units (however, distances on road signs are always marked in miles or yards, not feet; bridge clearances are given in meters as well as feet and inches), while its usage is widespread among the British public as a measurement of height.

  8. Shaku (unit) - Wikipedia

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

    The shaku had been standardized as 30.3 cm (11.93 in) since 1891. [5] This means that there are about 3.3 shaku (10 ⁄ 33) to one meter. [6] [7]This definition was established by Meiji government law; until then, even though the unit was given the same name, its length varied depending on the era.

  9. Flight level - Wikipedia

    en.wikipedia.org/wiki/Flight_level

    Therefore, a pressure altitude of 32,000 ft (9,800 m) is referred to as "flight level 320". In metre altitudes the format is Flight Level xx000 metres. Flight levels are usually designated in writing as FLxxx, where xxx is a two- or three-digit number indicating the pressure altitude in units of 100 feet (30 m). In radio communications, FL290 ...