right angle

/ˈɹaɪt ˌæŋɡəl/

noun

Half of the angle formed by a single straight line, equivalent to 90 degrees.

Opposite
oblique angle
OriginLatin angulus rectus →
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Meanings

nounright angle (plural right angles)

plural right angles

  1. geometryHalf of the angle formed by a single straight line, equivalent to 90 degrees.
  2. mathematicsAn ∟ character.

Synonyms & antonyms

nounthe 90 degree angle between two perpendicular lines

Opposite
oblique angle
Broader
angle

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Latinangulus rectus
  2. Englishright angle

Calque of Latin angulus rectus.

More words from Latin

Full word history & related roots →

Translations

Ancient Greek ὀρθὴ γωνία
  • ὀρθὴ γωνία (orthḕ gōnía)angle of 90 degrees
Arabic زَاوِيَة قَائِمَة
  • زَاوِيَة قَائِمَةangle of 90 degrees
Bengali সমকোণ
  • সমকোণ (śomkōn)angle of 90 degrees
Bulgarian прав ъ́гъл
  • прав ъ́гъл (prav ắgăl)angle of 90 degrees
Catalan angle recte
  • angle recteangle of 90 degrees
Chinese Mandarin 直角
  • 直角 (zhíjiǎo)angle of 90 degrees
Czech pravý úhel
  • pravý úhelangle of 90 degrees
Danish ret vinkel
  • ret vinkelangle of 90 degrees
Dutch rechte hoek
  • rechte hoekangle of 90 degrees
Esperanto orto
  • ortoangle of 90 degrees
Estonian täisnurk
  • täisnurkangle of 90 degrees
Finnish suora kulma
  • suora kulmaangle of 90 degrees
French angle droit, droit
  • angle droitangle of 90 degrees
  • droitangle of 90 degrees
German rechter Winkel
  • rechter Winkelangle of 90 degrees
Greek ορθή γωνία
  • ορθή γωνία (orthí gonía)angle of 90 degrees
Hawaiian huina kūpono
  • huina kūponoangle of 90 degrees
Hebrew זָוִית יְשָׁרָה
  • זָוִית יְשָׁרָה (zavít yeshára)angle of 90 degrees
Hindi समकोण
  • समकोण (samkoṇ)angle of 90 degrees
Hungarian derékszög
  • derékszögangle of 90 degrees
Icelandic rétt horn
  • rétt hornangle of 90 degrees
Irish dronuillinn
  • dronuillinnangle of 90 degrees
Italian angolo retto
  • angolo rettoangle of 90 degrees
Japanese 直角
  • 直角 (chokkaku)angle of 90 degrees
Korean 직각
  • 직각 (jikgak)angle of 90 degrees
Latin angulus rectus
  • angulus rectusangle of 90 degrees
Māori koki hāngai
  • koki hāngaiangle of 90 degrees
Norwegian rett vinkel
  • rett vinkelangle of 90 degrees
Persian زاویه قائمه, گوشه راست
  • زاویه قائمه (zâviye-ye qâ'eme)angle of 90 degrees
  • گوشه راست (guše-ye râst)angle of 90 degrees
Polish kąt prosty
  • kąt prostyangle of 90 degrees
Portuguese ângulo reto
  • ângulo retoangle of 90 degrees
Romanian unghi drept
  • unghi dreptangle of 90 degrees
Russian прямо́й у́гол
  • прямо́й у́гол (prjamój úgol)angle of 90 degrees
Scottish Gaelic ceàrn ceart
  • ceàrn ceartangle of 90 degrees
Slovak pravý uhol
  • pravý uholangle of 90 degrees
Spanish ángulo recto, escuadra
  • ángulo rectoangle of 90 degrees
  • escuadraangle of 90 degrees
Swedish rät vinkel
  • rät vinkelangle of 90 degrees
Tagalog sihang tadlong
  • sihang tadlongangle of 90 degrees
Tamil செங்கோணம்
  • செங்கோணம் (ceṅkōṇam)angle of 90 degrees
Thai มุมฉาก
  • มุมฉาก (mum-chàak)angle of 90 degrees
Ukrainian прями́й кут
  • прями́й кут (prjamýj kut)angle of 90 degrees
Vietnamese góc vuông
  • góc vuôngangle of 90 degrees
Welsh cyfongl
  • cyfonglangle of 90 degrees
Cite this entry
APA

right angle. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/right%20angle

MLA

“right angle.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/right%20angle. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “right angle,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/right%20angle.

Source: right angle on Wiktionary, CC BY-SA 4.0.