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  2. 21:9 aspect ratio - Wikipedia

    en.wikipedia.org/wiki/21:9_aspect_ratio

    21:9" ("twenty-one by nine" or "twenty-one to nine") is a consumer electronics (CE) marketing term to describe the ultrawide aspect ratio of 64:27 (2. 370:1 or 21. 3:9), designed to show films recorded in CinemaScope and equivalent modern anamorphic formats. The main benefit of this screen aspect ratio is a constant display height when ...

  3. Ultrawide formats - Wikipedia

    en.wikipedia.org/wiki/Ultrawide_formats

    21:9 movies usually refers to 1024:429 ≈ 2.387, the aspect ratio of digital ultrawide cinema formats, which is often rounded up to 2.39:1 or 2.4:1 Ultrawide resolution can also be described by its height, such as "UW 1080" and "1080p ultrawide" both stands for the same 2560×1080 resolution.

  4. Display aspect ratio - Wikipedia

    en.wikipedia.org/wiki/Display_aspect_ratio

    As of 2013, many games are adopting support for 21:9 ultrawide resolutions, [31] which can give a gameplay advantage due to increased field of view, [23] although this is not always the case. [ 32 ] 4:3 monitors have the best compatibility with older games released prior to 2005 when that aspect ratio was the mainstream standard for computer ...

  5. 21 (number) - Wikipedia

    en.wikipedia.org/wiki/21_(number)

    As a biprime with proper divisors 1, 3 and 7, twenty-one has a prime aliquot sum of 11 within an aliquot sequence containing only one composite number (21, 11, 1, 0); it is the second composite number with an aliquot sum of 11, following 18. 21 is the first member of the second cluster of consecutive discrete semiprimes (21, 22), where the next such cluster is (33, 34, 35).

  6. 9 - Wikipedia

    en.wikipedia.org/wiki/9

    9 is the fourth composite number, and the first odd composite number. 9 is also a refactorable number. [ 2 ] Casting out nines is a quick way of testing the calculations of sums, differences, products, and quotients of integers in decimal , a method known as long ago as the 12th century.

  7. 9×21mm - Wikipedia

    en.wikipedia.org/wiki/9×21mm

    The 9×21mm pistol cartridge (also known as the 9×21mm GP, 9×21mm IMI, 9mm IMI, 9×21mm Italian, or 9mm Italian) was designed by Jager (Loano, Italy), then adopted and commercialised by Israel Military Industries for those jurisdictions where military service cartridges, like the 9×19mm Parabellum, are or were illegal for civilian purchase (i.e. Italy, France, Brazil, and Mexico).

  8. September 21 - Wikipedia

    en.wikipedia.org/wiki/September_21

    [8] [9] 1860 – Second Opium War: An Anglo-French force defeats Chinese troops at the Battle of Palikao. 1862 – Taiping Rebellion: The Ever Victorious Army defeats Taiping forces at the Battle of Cixi. [10] [11] 1896 – Anglo-Egyptian conquest of Sudan: British forces under the command of Horatio Kitchener take Dongola.

  9. Aspect ratio (image) - Wikipedia

    en.wikipedia.org/wiki/Aspect_ratio_(image)

    Many digital video cameras have the capability to record in 16:9 (= 4 2:3 2), and 16:9 is the only widescreen aspect ratio natively supported by the DVD standard. DVD producers can also choose to show even wider ratios such as 1.66:1, 1.75:1, 1.77:1 and 1.78:1 [ 1 ] within the 16:9 DVD frame by hard matting or adding black bars within the image ...