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I always thought there was something wrong about Pi (3.14159...). It seemed clumsy to use. I was distracted from figuring out why by the apparent simplicity of the constant. The circumference of a circle divided by its diameter just seemed so elegant. How could a constant so elegant be so cumbersome to use? Why would it always drag around its crutch of a **2**? Whose brain-child was '*radians*', a system for measuring angles that summed to **2π**?

These things confused mathmatics for me as a student, and now I know why. Pi is wrong. The better, correct, circle constant is Tau, **τ**, which is equal to the ever-present **2π**. Thanks to Michael Hartl for putting his finger on what is wrong with the way we teach maths with pi, pi. Thanks again, for pointing us to tau, and simpler, more intuitive ways to think about circles, angles, and all the (now) fun things we had to do in school trigonometry and above.

Thank you, for the Tau Manifesto.

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