Epsilon Tau Pi was created in 1999.
tau
So area of a circle is pi*(radius^2), since tau = 2*pi, then you have pi = (2*pi/2), so (2*pi/2)*radius^2 = (tau/2)*radius^2
Delta Tau Chi, better known as Delta House.
Pi is the worst number. People are always worshiping this number, even the most famous mathematicians. Tau is better than pi. It makes 2 times more sense than pi (literally). When pi is used in trigonometry, most things have to do with 2pi. Why not use tau? It makes much more sense. Tau = 2pi. Tau also adds 8 more angles to the unit circle (called the tau circle when using tau). There are more reasons why tau is better than pi. Look them up, and join the International Tau Movement.
Epsilon Tau Pi (ΕΤΠ) was founded in 1999 at the University of Dayton in Dayton, Ohio.
n radians = n/tau or n/(2*pi) of a whole turn.equivalently, 360/tau or 180/pi degrees.
Please see No, really, pi is wrong… The Tau Manifesto, by Michael Hartl.See alsoAre you a Tau-ist? Pi Day is Under Attack
it's a secret
In The Tau Manifesto, by Michael Hartl, a mathematician and physicist, Hartl asserts that Tau should replace pi in mathematics. He and others state Tau is more perfect than pi, a perfect completion of the circle and more broadly descriptive in mathematical problems, with Tau being double of pi. This idea has not yet been accepted into mainstream mathematics; pi continues to be taught and used.Though proponents of Tau made a "Tau Day" and have produced multi-media to explain the concept, this idea is not about religions, myths, gods, etc. Pi and Tau have no mythical figures or heroic battles. The argument is simply a new mathematical idea, one which may OR may never completely be accepted into mainstream teaching and practices.
They are both constants related to angular measure.
Some people argue that using tau (2π) instead of pi would simplify mathematical formulas and make them more intuitive, especially in fields like trigonometry where 2π represents a full rotation. However, the use of pi is deeply ingrained in mathematics and scientific literature, so changing to tau would require a significant shift in convention. Ultimately, whether to use pi or tau is a matter of personal preference and context.