chu vi

== Vietnamese == === Etymology === Sino-Vietnamese word from 周圍, composed of 周 (“circumference”) and 圍 (“to surround”). === Pronunciation === (Hà Nội) IPA(key): [t͡ɕu˧˧ vi˧˧] (Huế) IPA(key): [t͡ɕʊw˧˧ vɪj˧˧] (Saigon) IPA(key): [cʊw˧˧ vɪj˧˧] ~ [cʊw˧˧ jɪj˧˧] === Noun === chu vi (geometry) a perimeter chu vi hình vuông ― the perimeter of a square chu vi hình tròn ― the perimeter/circumference of a circle surroundings; vicinity; periphery ==== Usage notes ==== Unlike English perimeter, chu vi has no specific hyponym for "circumference". The độ dài đường tròn (literally “length of a circular line”) is often called the chu vi hình tròn (literally “bound of a circular shape”) in elementary geometry, just like the chu vi hình vuông (literally “bound of a squared shape”), which is properly called "perimeter" in English. In middle-school and higher geometry, precise terminology and distinctions must be understood.