đường tròn

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Vietnamese

Etymology

đường (“line”) +‎ tròn (“round”).

Pronunciation

Noun

đường tròn

(geometry, as a type of curve) a circle

Usage notes

Not to be confused with hình tròn which is a shape that has a diện tích (“area”). A đường tròn only has a độ dài (“length”) (also known as a chu vi (“perimeter”)), and can be described with an equation like other curves, such as the đường cônic (“conic sections”), elip (“ellipses”), parabol (“parabolae”) and hypebol (“hyperbolae”). A similar distinction is made in 3D geometry, whereby, for example, a "khối cầu" sphere has a thể tích (“volume”), but a "hình cầu" sphere only has a diện tích (“area”).

See also

Wikious

Boobota

Sagapedia