unit circle

English

The circumference of a unit circle (sense 1) is 2π units.

a diagram of the unit circle (sense 2) and its trigonometry

Noun

unit circle (plural unit circles)

2. (usually) A circle of radius 1.
4. (trigonometry, occasionally, the unit circle) The circle of radius 1 with centre at the origin, used in defining trigonometric functions.

Related terms

• unit hyperbola
• unit sphere

Translations

circle of radius 1

• Finnish: yksikköympyrä
• French: cercle unité (fr) m
• German: Einheitskreis (de) m
• Italian: circonferenza unitaria f
• Polish: okrąg jednostkowy m
• Spanish: circunferencia unitaria f
• Swedish: enhetscirkel (sv) c
• Tagalog: isahing bilog

circle of radius 1 with centre at the origin, used in trigonometry

• Czech: jednotková kružnice f
• Dutch: eenheidscirkel m
• Finnish: yksikköympyrä
• French: cercle trigonométrique (fr) m, cercle unité (fr) m
• German: Einheitskreis (de) m
• Hungarian: egységkör (hu)
• Italian: circonferenza unitaria f
• Polish: okrąg jednostkowy m
• Russian: едини́чный круг m (jediníčnyj krug)
• Spanish: circunferencia unitaria f
• Swedish: enhetscirkel (sv) c
• Tagalog: isahing bilog