יום הפאי — חידות Nerdle

March 14 written month-first is 3/14 — the first three digits of π — and what began as physicist Larry Shaw's 1988 Exploratorium party is now UNESCO's International Day of Mathematics. A day honouring a mathematical constant deserves an equation puzzle; miss it and Pi Approximation Day, July 22 (22/7, the classic fraction for π), offers a second chance. למטה מופיעה כל שנה בארכיון, וכל אחת מקשרת לחידות של אותו תאריך.