An arc is any part of a curved line or part of the circumference of a circle; the word comes from the Latin arcus for a bow, which also gives rise to "arch". Arc length is the distance along part of a curve.
For a circle of radius r, the length (s) of an arc covering θ degrees on that circle is given by
If the angle is measured in radians the length of the arc is given by the product of the radius and the angle, i.e., s = r θ. The arc is said to subtend the angle θ at the center of the circle.
Related categories• GEOMETRY
• PLANE CURVES
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