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what's the name for 2 pi

Mathematics
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"Steve"?
NOO!!!!!!
lol

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Other answers:

Seriously, it's just \(2\pi\). Is there a need to call it something else?
yes that's correct....look it up
Tau
from these pages, it looks like tau, but not 100% on that myself http://constitutionclub.org/2011/07/02/even-math-is-changing/ http://math-blog.com/2010/06/28/forget-pi-here-comes-tau/
Also 'full circle' / '1 complete period of sine or cosine function,' etc.
"360º" and so on, and so forth . . .
I still like "Steve".
Steve is a good name too. I think Tau might have an advantage - still being a Greek letter and all that. You know how mathematical constants can be . . .
Why do we use \(2\pi r\) when \(\pi d\) is perfectly satisfactory - except that it is not a natural result of the calculus derivation. \(\dfrac{d}{dr}\pi r^{2} = 2\pi r\). It would be counter productive to replace either \(2r = d\) or \(2\pi = \tau\)
How about angles around the unit circle? Quarter circle: π/2 or τ/4?
or total radian of the circle (?)

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