March 14 is World Pi Day, an annual celebration of the mathematical constant. This year the value of Pi rounded to four decimal places, 3.1416, equals March 14, 2016. DW's Audio Story explores the wonderful world of Pi.
Pi is all around us: in the discs of the moon, the arc of the flight path that takes us from London to Sydney, the waves of the sea and the recent discovery of gravitational waves that proves Albert Einstein's last unsolved theory.
Ever since Archimedes in ancient Greece used fractions to calculate Pi, the quest to pinpoint an ever more accurate number goes on. But it wasn't until the dawn of the computer age in the late 1940s, that the number of post-decimal digits for Pi expanded exponentially. At last count, it was 13 trillion digits.
Diana Fong joined the quest for mathematical answers and has this Audio Story.