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:Agree with Dpbsmith - the radius is essentially part of the definition of a circle (the locus of all points...). In other words, working with abstractions one is more likely to have ''r'' defined than ''d''. Perhaps the article should list both for clarity - and mention that this is the ''definition'' of pi. And, you're right, '''''pi should be 6.28318... !!!'''''. We should bring this to the attention of the authorities. [[User:Human|Human]] 15:59, 24 April 2007 (EDT)
:Agree with Dpbsmith - the radius is essentially part of the definition of a circle (the locus of all points...). In other words, working with abstractions one is more likely to have ''r'' defined than ''d''. Perhaps the article should list both for clarity - and mention that this is the ''definition'' of pi. And, you're right, '''''pi should be 6.28318... !!!'''''. We should bring this to the attention of the authorities. [[User:Human|Human]] 15:59, 24 April 2007 (EDT)
:: The Greeks defined pi to be the ratio of the area to the radius of the unit circle. That's why it came out 3.14... instead of 6.28... . I just edited the page to correct some slight mis-statements (the circumfrence is not a line because a line is by definition straight in Euclidean geometry), but it isn't worded well. Please fix the wording.