It comes around every March 14: the day that mathematical-minded smarties celebrate the constant number you get when dividing a circle’s perimeter (or circumference) by its diameter. It turns out that no matter how small or big the circle, the formula equates to roughly 3.14, thus represented by the π symbol, celebrated every 3/14. Which brings us to a titillating quote by American engineer and author Paul J. Nahin: “If π weren’t around, there w…