四周，周圍；圓周；圈線；周線。 ten miles in circumference周長十英里。
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the circumference of the circle is 2πr and the time for one revolution is 2πr/v. 圓的周長是2r，轉一圈的時間是2rv。
- The best of the early measurements of the earth's circumference was made by eratosthenes .
- Wheel circumference measurements are show in cms
- Large waist circumference means excess fat in body
- That point falls on the circumference of the circle
Circumference is the linear distance around the outside of a closed curve or circular object. The circumference of a circle is of special importance to geometric and trigonometric concepts.