perimeter
Meaning: The total length of the boundary of a two-dimensional shape, or the outer edge or boundary of an area.
In mathematics, perimeter is the sum of all side lengths of a polygon or the circumference of a circle. Outside geometry, it is widely used in military, security, and sports contexts to refer to the boundary of a defended or enclosed area. Common collocations include 'perimeter fence,' 'perimeter defence,' and 'within the perimeter.'
Examples
- The perimeter of the rectangular field measured two hundred and forty metres. 长方形场地的周长为二百四十米。El perímetro del campo rectangular medía doscientos cuarenta metros.その長方形の運動場の周長は240メートルであった。그 직사각형 운동장의 둘레는 240미터였다.
- Security guards patrolled the perimeter of the compound throughout the night. 保安人员整晩巡逻该区域的周界。Los guardias de seguridad patrullaron el perímetro del recinto durante toda la noche.警備員は一晩中、施設の周囲を巡回した。경비원들은 밤새 시설의 외곽을 순찰했다.
- Year six pupils calculated the perimeter of various shapes during their maths lesson. 六年级学生在数学课上计算了各种图形的周长。Los alumnos de sexto calcularon el perímetro de varias formas durante la clase de matemáticas.6年生の生徒たちは算数の授業でさまざまな図形の周長を計算した。6학년 학생들은 수학 수업 시간에 다양한 도형의 둘레를 계산했다.
Pronunciation
Usage Guide
Context: academic, scientific, professional
Tone: neutral
Origin & History
From Greek perimetros, from peri (around) and metron (measure). Entered English in the early 15th century via Latin perimetros.
Cultural Context
Era: Modern
Generation: All ages
Social background: Universal
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