Part 5/8:
As the presenter illustrates, if we take a square and start reducing its corners with a line thickness included, eventually, there comes a point where the thickness cannot permit further simplification without losing the essence of the shape. This means that with a thicker line, the ability to reduce to a 'truly circular' perimeter collapses under practical constraints.
The argument further posits that attempting to represent a circle with infinitely small parts does give the illusion of being circular, but it does not change the fundamental properties of how we measure circumference. The comparison here implies that both a thick and thin line could yield different visual results but would inherently conclude to the same value: for a circle, that conclusion remains firmly rooted in π.