How do I apply Green's theorem to a parametrized curve?

[nysnacc]

Homework Statement

Homework Equations

Green's theorem

The Attempt at a Solution

DO I first parametrize? For 1st part, I have 3 parametrizations, which I can then find the normal vector, and use in the integrals?

 

[vela]

I'm sure there are examples of similar problems worked out in your textbook. Try using them as a model for solving these problems.