[ruby-core:102016] [Ruby master Feature#17496] Add constant Math::TAU

Issue #17496 has been updated by akr (Akira Tanaka).


I feel a constant of Math::PI * 2 is useful especially for
`x * 360 / (Math::PI * 2)`.

We need not only `*` but also parenthesis.

`x * 360 / Math::TAU` is shorter than above.

However I like another name, Math::PI2.



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Feature #17496: Add constant Math::TAU
https://bugs.ruby-lang.org/issues/17496#change-89864

* Author: jzakiya (Jabari Zakiya)
* Status: Open
* Priority: Normal
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Excuse me if this has been brought up before.

This is a simple proposal to add the math constant ``Math::TAU`` = 2*``Math::PI``.

See: https://tauday.com/

``TAU`` has been included in a growing number of languages (Rust, Python3, Julia, et al), and this would add Ruby to that list, and make it even cooler. :-)



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