Eh?
Please define a point to me.
Please define a line.
Please define a line segment.
Please show me Pi as a complete number.
EH?
Did you see the article about the Japanese man who recited Pi to over 80,000 decimal places? Of course that is an infinitesimal portion of Pi.
[Pi is essentially undefined]
Pi is defined as the ratio of the circumference of a circle to the diameter.
Just because it cannot be expressed as a ratio of two integers (it is an irrational number) doesn't mean it cannot be defined exactly.
Eh? Please define a point to me. Please define a line. Please define a line segment. Please show me Pi as a complete number. EH?This is a pretty loopy argument. Pi clearly is defined, to the extent that any slightly abstract notion about the relationships of entities is. If you wanted to chase this overly pedantic argument down another step, you could claim nothing is defined, because it is defined in words, and when you look up to words, all you get is more words. Pi is defined well enough to put meat on the table with, and that's the telling criteria.
I'm just sort of mildly curious as to what further point you will be supporting if I concede to you that Pi is, in some significant manner, undefined?