“You could trust numbers, except perhaps for pi, but he was working on that in his spare time and it was bound to give in sooner or later.” — Terry Pratchett Copy Share Image
Pi is not merely the ubiquitous factor in high school geometry problems; it is stitched across the whole tapestry of mathematics, not just geometry's little corner of it. Pi occupies a key place in trigonometry too. It is intimately related… — Robert Kanigel Copy Share Image
