$${\mathtt{\pi}}$$ or τ
Pi or Tau. Which should we use and why.
Pie or Tau. Which should we use and why.
What's Tau.
Sorry i haven't learnt it yet.
Tau is the number of radians it takes to go around a circle.
Maths always makes me peckish, so if you don't mind could you please spell it "Pie"?
+354 
