I am trying to find more explanation of this method but still can not understand it.
It is hard to make sense to me by only semantic explanation.
As far as I found, it is to compute the areas of the orthographic projection of the polygon, but could anyone illustrate this idea?

There is the source I found from Ray-Polygon and Ray-Quadric Intersection Testing
I understand how to calculate Area of irregular polygons in 2D but for Newell’s method, I can not comprehends its principle.

If (A, B, C) are the plane’s normal and Why can we get A by calculating 2 x area of projection onto yz plane?
I just think one illustration can make me understand better.