<P> Pi Day is an annual celebration of the mathematical constant π ( pi ) . Pi Day is observed on March 14 ( 3 / 14 in the month / day format ) since 3 , 1 , and 4 are the first three significant digits of π . In 2009 , the United States House of Representatives supported the designation of Pi Day . </P>
<P> Pi Day is an annual celebration of the mathematical constant π ( pi ) . Pi Day is observed on March 14 ( 3 / 14 in the month / day format ) since 3 , 1 , and 4 are the first three significant digits of π . In 2009 , the United States House of Representatives supported the designation of Pi Day . </P>
when did the u.s. government recognize pi day as a holiday
when did the u.s. government recognize pi day as a holiday
2009
2009