Tau as 2pi

daniel.e2718 shared this idea 7 years ago
Declined

To get in depth on the subject, read this.

The feature request is to add a value, tau, that works exactly like pi in every way (symbolic; when typed, changes to the Greek letter; etc), except that its value is 2pi.

If this would conflict with anything (probably personal preference or existing projects), perhaps add a check-box under Advanced Settings to enable the use of tau in this manner.

1

I would have no qualms with using that...does it come from C = 2 pi r, what of C = pi d?

But I am just not sure it is needed. Do you recall what a gradient is? It was an attempt to change angle measurement to metric...fighting city hall is an up hill battle.

This may be a call for the developers and math pedagogist...

Tony

1

Hi,

I don't beleive this is needed. Also, pi is better :) http://www.thepimanifesto.com/

Cheers,

Zbynek

1

pi is better when you are working with semi-circles. Tau is better when you are working with whole circles. Both are good, both are valid. Tau is the more natural choice for problems involving a whole circle, since circles are defined by their radius, not their diameter. One whole turn should be one thing (1 tau), not two things (2 pi).

I have done a number of talks about this including at the MEI Conference. I also teach radians using tau and in my experience pupils pick up radians much more quickly and they actually enjoy using the radian as an angle unit. My experience of teaching radians has improved radically since I started using tau. I'm a big proponent.

I would appreciate being able to use tau in GeoGebra, like you can now in Google, Khan Academy and Desmos. It should be a simple enough thing to include :)

Thanks

1

Sorry we won't be adding that as it's a valid variable name. You can define it yourself though:

`τ=2 π `

1

It's usually the first thing I define when I open GeoGebra!

Thanks Mike, hope all's well :)

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