Learn more: http://www.khanacademy.org/video?v=gGXnILbrhsM
Using Green's Theorem to solve a line integral of a vector field

Length: 7 minutes

Green's Theorem Example 2

Length: 19 minutes

Introduction to Parametrizing a Surface with Two Parameters

Length: 16 minutes

Determining a Position Vector-Valued Function for a Parametrization of Two Parameters