> <\body> \; A parametric curve is defined as the image of a domain \> by a map >: <\equation*> \: U\\ \ \ where is the dimension of the ambient space of the curve. The domain is usually an interval of > which can be bounded or not. <\traverse> Rational curves are used in geometric modeling because\ <\itemize-dot> they are easy to draw they are easy to control \; <\initial> <\collection>