“π” = 3.14159.....

知道三月14号是什么节日吗？ 是“π”节，3.14159.....呀~~
枉我读了这么多年书，记“π”的数字比自己的生日还牢，
却竟然没想到他老人家也有庆生的呢。

Pi Day: It’s the geekiest time of the year
March 14 is Pi Day, a sacred celebration in which radius and circumference lovers
rejoice over circular snacks and decimal-reciting contests.

Pi (Greek letter “π”) is the symbol used in mathematics to represent a constant
— the ratio of the circumference of a circle to its diameter
— which is approximately 3.14159.