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Of course, that just changes the question: why was the symbol π defined as referring to the ratio of circumference to diameter, rather than the ratio of circumference to radius, 6.28... It really should have been; when you think of it, it is really the value 2π that keeps cropping up everywhere. [[User:Dpbsmith|Dpbsmith]] 15:28, 24 April 2007 (EDT)
Of course, that just changes the question: why was the symbol π defined as referring to the ratio of circumference to diameter, rather than the ratio of circumference to radius, 6.28... It really should have been; when you think of it, it is really the value 2π that keeps cropping up everywhere. [[User:Dpbsmith|Dpbsmith]] 15:28, 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)