# Parametrization

### From Conservapedia

**Parametrization** is a technique in calculus for expressing multiple variables in terms of only one variable, which is usually depicted as "t", over a specified range.

The most common parametrization is for a circle centered at the origin in the *xy*-plane:

*x*=*r*cos(*t*)

*y*=*r*sin(*t*)

*z*= 0

Always remember to be precise in determining the new limits on the new parameter *t*.

This technique is particularly useful for calculating extrema and line integrals.