Parallel Curves Formula- HELP PLEASE!!!!!

I initially posted this under pre-Claculus, I think that this is a more suitable forum.

I need help using the Parallel Curves formula as I do not understand it.

The Formula is :

Parallel curve - Wikipedia, the free encyclopedia
I do not understand how to use it.

I have all points on an initial Ellipse. I want to get a series of points on the parallel ellipse at distance a, so that the resulting Ellipse/Curve is Parallel to my initial one.

I need a numerical example (step by Step) of how to solve this. I am ignorant in differentiation, I am ashamed to say.

The Center of my Ellipse is not at (0,0).

Here are the initial Data I have:

Semi Major Axis = 300

Semi Minor Axis = 100

Center of Ellipse is at (325

, 150)

I have the following points that lay on my initial curve (I am only including 10 points for this example)

x=50.0 y=150.0

x=64.60409274419712 y=119.09193189994731

x=105.34840889200964 y=92.11125074884501

x=167.63100531626952 y=70.5919375890824

x=246.84993888980867 y=56.067973463048816

x=338.403266485459 y=50.07333941313367

x=432.12868437393 y=53.79356143875327

x=514.7275697259736 y=66.41038541758431

x=581.4945842792583 y=86.39071388031789

x=627.827784906616 y=112.20056578456459

x=649.1252284808784 y=142.3059600879351