Tau angles cirkel manifesto radialen strijd wiskundige tussen figuur особые некоторые картинка углы wetenschap Radians cosine sine multiples Pi times 2 visualized
Pi -- from Wolfram MathWorld
That time pi was almost legally changed to 3.2 or 4
Trigonometric values for pi
Pi tau math 2π side vs wolfram pie wouldPi wolfram mathworld The 'math guy' presents 5 facts about 3.14 : nprPi -- from wolfram mathworld.
2 pi or not 2 pi?—wolfram blogTau day .
