Parametric equation - Wikipedia
https://en.wikipedia.org/wiki/Parametric_equation
OverviewApplicationsExamples in two dimensionsExamples in three dimensionsExample with vectorsUnderdetermined linear systemsSee alsoNotesIn mathematics, a parametric equation defines a group of quantities as functions of one or more independent variables called parameters. Parametric equations are commonly used to express the coordinates of the points that make up a geometric object such as a curve or surface, called a parametric curve and parametric surface, respectively. In such cases, the equations are collectively called a parametric representation, or parametric system, or parameterization (altern…
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