## brookester6 2 years ago what's the name for 2 pi

1. tkhunny

"Steve"?

2. brookester6

NOO!!!!!!

3. brookester6

lol

4. tkhunny

Seriously, it's just $$2\pi$$. Is there a need to call it something else?

5. brookester6

yes that's correct....look it up

6. CliffSedge

Tau

7. jim_thompson5910

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/

8. CliffSedge

Also 'full circle' / '1 complete period of sine or cosine function,' etc.

9. CliffSedge

"360º" and so on, and so forth . . .

10. tkhunny

I still like "Steve".

11. CliffSedge

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 . . .

12. tkhunny

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 $$2\pi = \tau$$

13. CliffSedge

How about angles around the unit circle? Quarter circle: π/2 or τ/4?

14. Chlorophyll

or total radian of the circle (?)