### Overview

Graphing curves described by equations in polar coordinates can be very rewarding, but we must be attentive when plotting points whose radii are negative. Occasionally it is helpful to convert from polar coordinates to Cartesian (xy) coordinates in order to better understand a curve.

### Lecture Video and Notes

#### Video Excerpts

Clip 1: Graph of r = 2a cos(θ)

Clip 3: Polar Coordinates and Conic Sections