By Hojae Lee, a Berkeley Math Circle assistant, and Laura Pierson, a high-school student at The College Preparatory School, in Oakland, Calif. It’s time to celebrate Π Day! And 3/14/15 is a special Π Day, as the date forms the first five digits of Π (3.1415), and at 9:26:53, the date and time will be the first … Continue reading »