JC, ...
I suppose (imho) that it can be said it's like building a home. A good foundation leads to a solid structure.
Believe you me, ... I know what you mean by "nodding your head up and down".
Just like when we're trying to figure out a problem ... the guy says:
"In Euclidean geometry ... where is the perimeter of the regular n-gon inscribed in the circle.
Thus, "
THUS!, ... Ya, .... right ... Thus!
p.s. ... If you really want to read about this, ... I invite you to pop over to : http://www.math.uncc.edu/~droyster/math ... node1.html