High Quality Content by WIKIPEDIA articles! A parallel of a curve is the envelope of a family of congruent circles centered on the curve. It generalises the concept of parallel lines.It is sometimes called the offset curve but the term "offset" often refers also to translation. The term "offset curve" is used, e.g., in numerically controlled machining (and in other computer graphics applications), where it describes the shape of the cut made by a round cutting piece, which is "offset" from the trajectory of the cutter by a constant distance in the direction normal to the cutter trajectory at every point.

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