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The circumference of a circle is the line that forms its boundary.
The convex circumference of a circle $C$ is the circumference $C$ from a point outside $C$.
The concave circumference of a circle $C$ is the circumference $C$ from a point inside $C$.
Also defined as
The term circumference is also used to refer to the length of this line.
Technically, the correct term for the length of the circumference of a circle is perimeter.
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): circumference
- 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): circumference