Arc

An arc is a part of a circle. An arc is a curved line. The curve of an arc is constant and does not change (that is, an arc has constant curvature). It sometimes is portrayed as a dotted line.

In a circle, the arc from point A to point B is written as . We call the length of an arc an arc length. For an arc on a circle with radius  subtended by an angle , its arc length is precisely .

 Related pages 

 Arcsecond
 Meridian arc

 References 

category:Geometry