parametric equation
An equation of the form x = f(t) and y = g(t) in which x and y are expressed separately in terms of an independent parameter t, and f and g are two functions.

For example, a circle centered at the origin with radius r can be described as x2 + y2 = r2. The same circle can be expressed using the parametric equation x = r cos(t) and y = r sin(t).

Related Term: equation

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