{{General geometry}}

{{General geometry}}

In [[geometry]], the '''circumference''' ({{etymology|la|{{wikt-lang|la|circumferēns}}|carrying around, circling Heyy love this topic}}) is the [[perimeter]] of a [[circle]] or [[ellipse]]. The circumference is the [[arc length]] of the circle, as if it were opened up and straightened out to a [[line segment]].{{citation|first1=Jeffrey|last1=Bennett|first2=William|last2=Briggs|title=Using and Understanding Mathematics / A Quantitative Reasoning Approach|edition=3rd|publisher=Addison-Wesley|year=2005|isbn=978-0-321-22773-7|page=580}} More generally, the perimeter is the [[curve length]] around any closed figure.

In [[geometry]], the '''circumference''' ({{etymology|la|{{wikt-lang|la|circumferēns}}|carrying around, circling}}) is the [[perimeter]] of a [[circle]] or [[ellipse]]. The circumference is the [[arc length]] of the circle, as if it were opened up and straightened out to a [[line segment]].{{citation|first1=Jeffrey|last1=Bennett|first2=William|last2=Briggs|title=Using and Understanding Mathematics / A Quantitative Reasoning Approach|edition=3rd|publisher=Addison-Wesley|year=2005|isbn=978-0-321-22773-7|page=580}} More generally, the perimeter is the [[curve length]] around any closed figure.

Circumference may also refer to the circle itself, that is, the [[Locus (geometry)|locus]] corresponding to the [[Edge (geometry)|edge]] of a [[Disk (geometry)|disk]].

Circumference may also refer to the circle itself, that is, the [[Locus (geometry)|locus]] corresponding to the [[Edge (geometry)|edge]] of a [[Disk (geometry)|disk]].

The {{em|{{visible anchor|circumference of a sphere}}}} is the circumference, or length, of any one of its [[great circle]]s.

The {{em|{{visible anchor|circumference of a sphere}}}} is the circumference, or length, of any one of its [[great circle]]s.