The distance all the way around a circle. It is like the circle’s version of a perimeter.
From Latin "circumferentia," from "circum" meaning "around" and "ferre" meaning "to carry." It literally means "what is carried around," referring to the line that goes all the way around a circle.
The word hides a story: imagine you "carry" a rope around a circle once—that path is the circumference. The famous formula C = 2πr quietly links a simple walk around the edge to the deep constant π that shows up all over mathematics.
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