# Diameter

Diameter of a circle

In geometry, the diameter of a circle is a line from one side directly to the opposite side through the centre. It can also be defined as the longest chord of a circle. These are both explanations to describe the diameter in a sphere too.

The letter d or the symbol are often used as a symbol for the diameter. The diameter's length is often called the diameter itself.

The diameter's length is twice the radius, and therefore the relationship between the diameter's length and radius can be shown with the equations:

${\displaystyle d=2r}$ and ${\displaystyle r={\frac {d}{2}}}$

Other Languages
Afrikaans: Deursnee
Alemannisch: Durchmesser
العربية: قطر (هندسة)
asturianu: Diámetru
azərbaycanca: Diametr
বাংলা: ব্যাস
Bân-lâm-gú: Ti̍t-kèng
беларуская: Дыяметр
беларуская (тарашкевіца)‎: Дыямэтар
български: Диаметър
bosanski: Prečnik
català: Diàmetre
Чӑвашла: Диаметр
chiShona: Gurapakati
Cymraeg: Diamedr
dansk: Diameter
Deutsch: Durchmesser
eesti: Diameeter
Ελληνικά: Διάμετρος
English: Diameter
español: Diámetro
Esperanto: Diametro
euskara: Diametro
français: Diamètre
galego: Diámetro
한국어: 지름
Հայերեն: Տրամագիծ
hrvatski: Promjer
Bahasa Indonesia: Diameter
íslenska: Þvermál
italiano: Diametro
עברית: קוטר
Basa Jawa: Dhiamèter
ქართული: დიამეტრი
қазақша: Диаметр
Kiswahili: Kipenyo
Latina: Diametros
latviešu: Diametrs
Lëtzebuergesch: Duerchmiesser
lietuvių: Skersmuo
Limburgs: Diameter
македонски: Пречник
മലയാളം: വ്യാസം
Bahasa Melayu: Diameter
Nederlands: Diameter

Nordfriisk: Trochmeeder
norsk: Diameter
norsk nynorsk: Diameter
occitan: Diamètre
oʻzbekcha/ўзбекча: Diametr
ភាសាខ្មែរ: អង្កត់ផ្ចិត
Plattdüütsch: Dörmeter
polski: Średnica
português: Diâmetro
română: Diametru
Runa Simi: Raqta
русский: Диаметр
Scots: Diameter
slovenčina: Priemer (geometria)
slovenščina: Premer
ślůnski: Szyrzka
Soomaaliga: Dhexroor
српски / srpski: Пречник
srpskohrvatski / српскохрватски: Promjer
suomi: Halkaisija
svenska: Diameter
Tagalog: Bantod
தமிழ்: விட்டம்
татарча/tatarça: Диаметр
тоҷикӣ: Диаметр
Türkçe: Çap
українська: Діаметр
Tiếng Việt: Đường kính
Winaray: Diametro
ייִדיש: דיאמעטער