“π” = 3.14159.....

知道三月14號是什麽節日嗎？ 是“π”節，3.14159.....呀~~
枉我讀了這麽多年書，記“π”的數字比自己的生日還牢，
卻竟然沒想到他老人家也有慶生的呢。

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.