radius
意味: A straight line from the centre of a circle or sphere to any point on its circumference, or the length of such a line.
The radius is half the diameter and is the fundamental measurement used to calculate the area and circumference of a circle. In broader usage, it describes the distance from a central point within which something operates or exists, as in 'within a five-mile radius.' The plural is radii in formal mathematical contexts, though radiuses is also accepted.
例文
- The radius of the circle was measured at exactly seven centimetres. 该圆的半径被测量为恰好七厘米。El radio del círculo se midió en exactamente siete centímetros.その円の半径はちょうど7センチメートルと測定された。그 원의 반지름은 정확히 7센티미터로 측정되었다.
- The explosion was felt within a radius of ten kilometres. 爆炸在十公里半径范围内都有感受到。La explosión se sintió en un radio de diez kilómetros.爆発は半径10キロメートル以内で感じられた。폭발은 반경 10킬로미터 이내에서 감지되었다.
- She drew a circle with a radius of five units using a pair of compasses. 她用圆规画了一个半径为五个单位的圆。Dibujó un círculo con un radio de cinco unidades usando un compás.彼女はコンパスを使って半径5単位の円を描いた。그녀는 컴퍼스를 사용하여 반지름 5단위의 원을 그렸다.
発音
使い方ガイド
場面: academic, scientific, professional
トーン: neutral
起源と歴史
From Latin radius (staff, spoke of a wheel, ray of light). The geometric sense developed in the 16th century from the image of spokes radiating from a wheel's hub.
文化的背景
Era: Modern
Generation: All ages
Social background: Universal
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