Curve order rules
As shown in Figure 38, curves and loops can be ordered as 2, 3, or 4. An order 2 curve is a linear curve such as a polyline. An order 3 curve is a quadratic curve that is used in an arc, a section of an ellipse, or for smoothing the corners of a polygon. An order 4 curve is a cubic curve that is commonly used in freeform design tools. The order of a curve must always be at least two (a linear curve).
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