Don't you think we are just running around in a circle at this point? Try reading all the postings in this thread again, and again. Maybe you'd get the answers.Originally Posted byc_323_h

May I say that pi is just a number, an irrational number, a real number. When pi is not used to denote an angle, then pi is only an everyday, garden-variety, number. Maybe you always associate pi with radians. Don't.

As for the exact values of any decimal number, you search the Web, or books, re changing decimals to fractions.

If the decimals are irrational, or cannot be expressed by a fraction, then you will not get the "exact" number equivalent of that decimal.

Which brings me to a question, why are you so fascinated by exact numbers in their fraction forms? I thought---or at least for me---decimals are more "easy to visualize" than fractions as far as dimension is concerned.