
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 x^{2} + y^{2} = r^{2}. The same circle can be expressed using the parametric equation x = r cos(t) and y = r sin(t).

