## Chapter 13: Polar Coordinates, Complex Numbers, and Moving ObjectsIn this chapter you will learn about polar coordinates, where r and Θ are used instead of x and y. Polar coordinates allow them to plot complicated graphs such as the five-leaved rose in the icon at the top of each even-numbered page and in Figure 13-0a. These coordinates have surprising connections to imaginary and complex numbers and to the parametric functions students studied in earlier chapters. |