image credits: Biography.com |

**Pi Day**is the unofficial holiday that celebrates the mathematical constant pi (π) on March 14 in the month/day date format because the digits in this date correspond with the first three digits of π (3.14). It has become an international observance that is celebrated live and online and also celebrates

**Albert Einstein’s birthday**.

Pi Approximation Day is held on July 22 in
the day/month date format because it is the approximate value of π (22/7 =
3.14).

**What is Pi (π)?**

image credits: in2eastafrica |

The lower case Greek letter π is used
because it is the first letter of the Greek work περίμετρος (perimeter), which
probably refers to its use in the formula perimeter divided by diameter equals
the constant for all circles. The concept of π has become the most common
ground between mathematicians and non-mathematicians.

**What do people do?**

There are many activities that celebrate Pi Day such as games,
creating some type of pi ambiance, eating “pi” foods, converting things into
pi, making strange mathematical endeavors like having a contest to see who
knows the most digits of pi. Many people celebrate Pi Day by eating pie and
discussing the relevance of π. Many teachers will use this date to engage
students in activities related to pi by singing songs and carols about pi and
developing pi projects.

Mathematicians, teachers, museum directors,
math students of all ages and other enthusiasts celebrate the number with pi
recitations, pie-baking, pie-eating contests and math-related activities.

**The First Pi Day**

Pi Day celebrations was founded by Larry Shaw and it was first held at the San Francisco Exploratorium in 1988. The celebrations began with the public and museum staff marching around a circular space and then eating fruit pies. The museum has since then added pizza to its menu and has grown to include activities such as creating Pi puns, Pi-related antics, and many other activities that involve Pi.

**Alternative Pi Days and Pi Approximation Days**

Pi Day and/or Pi Approximation Day can be
celebrated on other calendar dates such as:

July 22: When 22 is divided by 7, it equals
3.14.

March 4: When 14% of the 3rd month has
elapsed.

April 5: When 3.14 months of the year have
elapsed.

April 26: The Earth has traveled two
radians of its orbit on this day (April 25 in leap years). This is celebrated
exactly on the 41st second of the 23rd minute of the 4th hour on April 26 or
the 116th day. (In leap years, it is celebrated exactly on the 3rd second of
the 2nd minute of the 12th hour on April 25 or the 116th day.)

November 10: The 314th day of the year
(November 9 in leap years).

December 21, 1:13 p.m.: The 355th day of
the year (December 20 in leap years), celebrated at 1:13 for the Chinese
approximation 355/113.

Source: timeanddate.com (sligtly abridged)

You can read more about Pi Day on

**@ Pi Day 2012.**

*Teaching & Learning*
If you are looking for teachers' resources, check

**TeachPi**, where you'll find ideas for Pi Day activities, learning and entertainment!
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