Curve can be understood as a trajectory of a moving dot.

Applet Bezier curve, change axomometry with keys from 1 to 6

Applet Bezier curve, change axomometry with keys from 1 to 6

Curves and surfaces can be defined :- analytically - i.e. explicitly, implicitly and parametrically.
- interpolation - dots are given that are to be crossed by the curve or surface .
- aproximately - we approach to given dots of surface or curve.

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