Is it correct to say that NURBS are not part of Euclidean Geometry?

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Is it correct to say that NURBS Surfaces are not part of Euclidean Geometry? I am asking this question in the context of CAD for product design and architecture. If not, what would be an appropriate way (or category) to distinguish 3D objects made up by discrete lines, planes, arcs, spheres and cylinder segments versus curved "freeform" surfaces that can only be represented exactly with NURBS?