Standart televizyon için '''4:3''' (1.3{{overline|3}}:1) (genellikle ''"Dörde Üç"'' olarak okunan) for standard television has been in use since the invention of [[moviefilm camerakamerası|moving picture camera]]s and many [[computer monitor]]s used to employ the same aspect ratio. 4:3 was the aspect ratio used for [[35 mm film]]s in the silent era. It is also very close to the 1.375:1 aspect ratio defined by the [[Academy of Motion Picture Arts and Sciences]] as a standard after the advent of optical [[sound-on-film]]. By having TV match this aspect ratio, movies originally photographed on 35 mm film could be satisfactorily viewed on TV in the early days of the medium (i.e. the 1940s and the 1950s). When [[movie theater|cinemasinema]] attendance dropped, film endüstrisini televizyondan farklılaştırmak amacıyla Hollywood created [[widescreengeniş ekran]] aspectçerçeve ratiosoranlarını (suchdaha asönce thebahsedilen 1.85:1 ratiooranı mentioned earliergibi) inoluşturdu. order to differentiate the film industry from TV.Fakat However since the start of the 21st century broadcasters worldwide are phasing out the 4:3 standard entirely, as technology started to favour the 16:9/16:10 aspect ratio of all modern HD TV sets, computer monitors as well as broadcast cameras.
=== 16:9 standardı ===
{{Ana|16:9}}
'''16:9''' (1.7{{overline|7}}:1) (genellikle ''"On Altıya Dokuz"'' olarak adlandırılan) is the international standard format of [[Yüksek çözünürlüklü televizyon|HDTV]], standart dijital [[televizyon]] ve [[PALplus]] analog geniş ekran televizyontelevizyonun [[PALplus]]uluslararası standart formatıdır. JapanJaponya'snın [[Multiple sub-Nyquist sampling encoding|Hi-Vision]]'ı originally started with aaslında 5:3 ratiooranla butbaşladı, convertedfakat whenuluslararası thestandartlar internationalgrubu standardsdaha groupgeniş introduced a wider ratio ofbir 5⅓'e to3 3oranını (=16:9) tanıtınca dönüştürüldü. ManyÇok sayıda [[digitaldijital video]] cameraskamerası have16:9'da thekayıt capabilityedebilme toyeteneğine recordsahip inve 16:9,andyalnızca 16:9geniş ekran çerçeve oranı doğallıkla is the only widescreen aspect ratio natively supported by the [[DVD-Video#Frame_size_and_frame_rate|DVD]] standardstandardı tarafından doğallıkla desteklenen . DVD producers can also choose to show even wider ratios such as 1.85:1 and 2.39:1<ref name="anamorphic" /> within the 16:9 DVD frame by [[Matte_(filmmaking)#Mattes_and_widescreen_filming|hard matting]] or adding black bars within the image itself. Some films which were made in a 1.85:1 aspect ratio, such as the U.S.-Italian co-production ''[[Man of La Mancha (film)|Man of La Mancha]]'', fit quite comfortably onto a 1.7{{overline|7}}:1 HDTV screen and have been issued anamorphically enhanced on DVD without the black bars.
== Obtaining height, width and area of the screen ==
