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The aspect ratio of a shape
Shape

The shape of an object located in some space is the part of that space occupied by the object, as determined by its external boundary ? abstracting from other properties such as colour, content, and material composition, as well as from the object's other spatial properties ....
 is the ratio of its longer dimension
Dimension

In mathematics, the dimension of a space is roughly defined as the minimum number of coordinates needed to specify every point within it. For example: a point on the unit circle in the plane can be specified by two Cartesian coordinates but one can make do with a single coordinate , so the circle is 1-dimensional even though it exists in...
 to its shorter dimension. It may be applied to two characteristic dimensions of a three-dimensional shape, such as the ratio of the longest and shortest axis, or for symmetrical objects that are described by just two measurements, such as the length and diameter of a rod. The aspect ratio of a torus
Torus

In geometry, a torus is a surface of revolution generated by revolving a circle in three dimensional space about an axis coplanar with the circle, which does not touch the circle....
 is the ratio of the major axis R to the minor axis r.








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The aspect ratio of a shape
Shape

The shape of an object located in some space is the part of that space occupied by the object, as determined by its external boundary ? abstracting from other properties such as colour, content, and material composition, as well as from the object's other spatial properties ....
 is the ratio of its longer dimension
Dimension

In mathematics, the dimension of a space is roughly defined as the minimum number of coordinates needed to specify every point within it. For example: a point on the unit circle in the plane can be specified by two Cartesian coordinates but one can make do with a single coordinate , so the circle is 1-dimensional even though it exists in...
 to its shorter dimension. It may be applied to two characteristic dimensions of a three-dimensional shape, such as the ratio of the longest and shortest axis, or for symmetrical objects that are described by just two measurements, such as the length and diameter of a rod. The aspect ratio of a torus
Torus

In geometry, a torus is a surface of revolution generated by revolving a circle in three dimensional space about an axis coplanar with the circle, which does not touch the circle....
 is the ratio of the major axis R to the minor axis r.

Applications and uses

The term is most commonly used with reference to:
  • graphic / image
    • image aspect ratio
      Aspect ratio (image)

      The aspect ratio of an is its width divided by its height.Aspect ratios are mathematically expressed as x :y and x?y . The most common aspect ratios used today in the presentation of films in movie theaters are 1.85:1 and 2.39:1....
    • computer display standard
      Computer display standard

      Various computer display standards or display modes have been used in the history of the personal computer. They are often a combination of display resolution , color depth , and refresh rate ....
    • paper size
      Paper size

      There have been many standard sizes of paper at different times and in different countries, but today there are two widespread systems in use: the international standard and the North American sizes....
    • standard photographic print sizes
      Standard photographic print sizes

      Standard photographic print sizes are used in photographic printing.They are often denoted with a code of the format nR, where the number n represents the length of the shorter edge in inches....
    • standard ad size
      Standard ad size

      The Universal Ad Package is a set of four advertisement sizes that all compliant member publishers have agreed to support for Internet advertising....
    • Business card#Dimensions
      Business card

      Business cards are cards bearing business information about a company or individual. They are shared during formal introductions as a convenience and a memory aid....
    • Aspect ratio (newspaper)
      Aspect ratio (newspaper)

      Newspapers are printed in many different aspect ratios.Manfred Werfel Research Director and Vice President of Ifra predicts a trend towards the Berliner format....
    • pixel aspect ratio
      Pixel aspect ratio

      Pixel aspect ratio is a term used in computer graphics and digital video. It describes a mathematical ratio between width and height of a pixel....
  • tire code
    Tire code

    Tire code or Tyre code - Automobile tires are described by an alphanumeric code, which is generally molded into the sidewall of the tire....
  • tire sizing
    Tire sizing

    Plus sizing is the practice of changing a specific tire to a larger size while compensating with reductions in other aspects of the tire's size so that the new tire has the same diameter and circumference as the original tire to prevent any changes in speedometer accuracy, power and traction control....
  • wing aspect ratio
    Aspect ratio (wing)

    In aerodynamics, the aspect ratio of a wing is defined as the square of the wing span divided by the wing area.whereInformally, a high aspect ratio indicates long, narrow wings, whereas a low aspect ratio indicates short, stubby wings....
     of an aircraft
    Aircraft

    An aircraft is a vehicle which is able to flight by being supported by the air, or in general, the atmosphere, of a planet. Examples include balloons, airplanes and helicopters....
     or bird
    Bird

    Birds are wing, Bipedalismal, endothermic , vertebrate animals that lay egg . There are around 10,000 living species, making them the most numerous tetrapod vertebrates....
  • Astigmatism
    Astigmatism

    An optical system with astigmatism is one where ray that propagate in two perpendicular Plane have different focus . If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp focus at two different distances....
     of an optical lens


Examples

From left to right:
  • 1. = 4:3: Computer monitors (VGA, XGA
    XGA

    XGA, the Extended Graphics Array, is an International Business Machines display standard introduced in 1990. Today, it is the most common appellation of the 1024 ? 768 pixels display resolution, but the official definition is broader than that....
    , etc), SDTV
  • 1.414… = v2:1: Silver ratio
    Silver ratio

    The silver ratio is a Mathematics constant. Its name is an allusion to the golden ratio; analogously to the way the golden ratio is the limiting ratio of consecutive Fibonacci numbers, the silver ratio is the limiting ratio of consecutive Pell numbers....
    , International paper sizes (ISO 216
    ISO 216

    ISO 216 specifies International Organization for Standardization paper sizes used in most countries in the world today. It is the standard which defines the commonly available A4 paper size....
    )
  • 1.5 = 3:2: 35 mm film
    35 mm film

    35 mm film is the basic film gauge most commonly used for both still photography and motion pictures, and remains relatively unchanged since its introduction in 1892 by William Dickson and Thomas Edison, using film stock supplied by George Eastman....
  • 1.618…: Golden ratio
    Golden ratio

    In mathematics and the arts, two quantities are in the golden ratio if the ratio between the sum of those quantities and the larger one is the same as the ratio between the larger one and the smaller....
  • 1.6 = 16:10 = 8:5: Widescreen
    Widescreen

    A widescreen image is a film, computer or television image with a wider and shorter aspect ratio than the standard Academy frame developed during the classical Hollywood cinema era....
     computer monitors (WXGA, etc.)
  • 1. = 16:9: HDTV


See also

  • Ratio
    Ratio

    A ratio is an expression which compares quantities relative to each other. The most common examples involve two quantities, but in theory any number of quantities can be compared....
  • Equidimensional
    Equidimensional

    Equidimensional is an adjective applied to objects that have nearly the same size or spread in multiple directions. As a mathematical concept, it may be applied to objects that extend across any number of dimensions....
     ratios in 3D