In this interactive figure, polar equations for lines and circles are given. When defining the function [math]r[/math], use the argument [math]t[/math] instead of [math]\theta[/math].

[i]This applet was developed for use with [url=https://www.pearson.com/en-us/subject-catalog/p/interactive-calculus-early-transcendentals-single-variable/P200000009666]Interactive Calculus[/url], published by Pearson.[/i]