Lecture #6 looked at basic kinematic models of robots.
Notes are available as:
The lecture covered material from Chapter 3 of the textbook. You should read this if you have the textbook.
Note that the textbook and the notes seem to have an error: where they refer to the diameter r of the wheel, I think they mean the radius.
One day I'll write up the "on blackboard" derivation stuff, but for now you'll have to rely on your own notes.