**Learning objectives**

- Describe regions of the plane or 3-space algebraically
- Work with polar coordinates in the plane
- Work with cartesian, cylindrical, and spherical coordinates in 3-space

**Before class**

- Read Hughes-Hallett sections 16.3, 16.4, 16.5,
- Ponder Hughes-Hallett problems: 16.4: 3, 4, 9, 11, 13, 15, 21, 25, 26, 31, 32, 33; 16.5: 1, 9, 11, 12-18, 27, 28, 29.

**In class**