Johan Claeys
Math Abundance: Polar Coordinates of a Point P
Defines a polar coordinate, pole, and polar axis. Includes graph.
CK-12 Foundation
Ck 12: Trigonometry: Rectangular to Polar Conversions
[Free Registration/Login may be required to access all resource tools.] This lesson introduces Polar coordinates.
National Council of Teachers of Mathematics
The Math Forum: Analytic Geometry: Polar Coordinates
This site from The Math Forum provides great information on polar coordinates. You can access this information either by clicking on the coordinates link or just scrolling down, it is the first one listed on the page. Includes several...