Editing Curve (section)

===Differentiable arc===
{{redirect|Arc (geometry)|the use in finite projective geometry|Arc (projective geometry)|use in circles specifically|Circular arc}}

In [[Euclidean geometry]], an '''arc''' (symbol: '''⌒''') is a [[connected set|connected]] subset of a [[Differentiable function|differentiable]] curve. 

Arcs of [[line (geometry)|lines]] are called [[line segment|segments]], [[ray (geometry)|rays]], or [[line (geometry)|lines]], depending on how they are bounded.

A common curved example is an arc of a [[circle]], called a [[circular arc]]. 

In a [[sphere]] (or a [[spheroid]]), an arc of a [[great circle]] (or a [[great ellipse]]) is called a '''great arc'''.