No, pi is wrong: The Tau Manifesto
Why do people even measure rotations in radians? It’s a stupid unit that’s never ever written out but always expressed as either “pi radians” or “tau radians”, and just like with degrees, or the measure which has 200 to a circle you end up spending time teaching students how to convert to the sensible unit we all default to, which is just plain rotations. Everyone understands intuitively half a rotation. A full rotation or a quarter rotation. And when you tell a student 30 degrees, they all spend a bit of mental effort thinking before they go “Ah yes, 1&#x2F;12 of a full rotation” and if you tell them 0.52 radians they’ll just look at you blankly stating they need a calculator before they know what are you are on about.