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# Pi day

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### Pi day

1. 1.  Name : Şeyma Surname : Sevindik Student No : 20111399 Departmant : IMAT Lesson : Eng 102 Subject : Pi Day Teacher : Gulsen Husseın
2. 2.  Definition of Pi Name of Pi Pi Day History of Pi Day Celebrates
3. 3.  π is commonly defined as the ratio of circle’s cicum ference C to its diameters d: The ratio C/d is constant, regardless of the circles size. For example, if a circle has twice the diameter d of another circle it will also have twice the circumference C, preserving the ratio C/d. This definition of π is not universal, because it is only valid in flat (Euclidean) geometry and is not valid in curved (non-Euclidean) geometries.
4. 4.  For this reason, some mathematicians prefer definitions of π based on calculus or trigonometry that do not rely on the circle. One such definition is; π is twice the smallest positive x for which cosine (x) equals 0.
5. 5.  The symbol used by mathematicians to represent the ratio of a circles circumference to its diameter is the Greek letter π. That letter can be denoted by the Latin word pi, which is also used to represent the same ratio. In English, π is pronounced as “pie”. The lower-case letter π (or π in sans-serif front) is not to be confused with the capital letter Π, which denotes a product of a sequence.
6. 6.  Pi Day is an unofficial holiday commemorating the mathematical constant π (pi). Pi Day is celebrated on March 14 (or 3/14 in month/day date format), since 3, 1 and 4 are the three most significant digits of π in the decimal from. In 2009. the United States House of Representatives supported the designation of Pi Day.
7. 7.  Pi Approximation Day is held July 22 (or 22/7 in day/month date format), since the fraction 22⁄7 is a common approximation of π.
8. 8.  The earliest known official or large-scale celebration of Pi Day was organized by Larry Shaw in 1988 at the San Fransisco Exploratorium, where Shaw worked as a physicist, with staff and public marching around one of its circular spaces, then consuming fruit pies. The Exploratorium continues to hold Pi Day celebrations On March 12, 2009, the U.S. House of Representatives passed a non-binding resolution (HRES 224), recognizing March 14, 2009, as National Pi Day.
9. 9.  For Pi Day 2010, Google presented a Google Doodle celebrating the holiday, with the word Google laid over images of circles and pi symbols.
10. 10.  There are many ways of celebrating Pi Day. These include eating pie and discussing the significance of number π. The Massachusetts Institute of Technogy has often mailed its application decision letters to prospective students for delivery on Pi Day. Starting in 2012, MIT has announced it will post those decisions (privately) online on Pi Day at exactly 6:28pm, which they have called "Tau Time", to honor the rival numbers Pi and Tau equally.
11. 11.  The town of Princeton New Jersey hosts numeros events in a combined celebration of Pi Day and Albert Einstein’s birthday, which is also March 14. Einstein lived in Princeton for more than twenty years while working at the Institute for Advanced Study. In additional to pie eating and recitation contests there is an annual Einstein look-a like contest
12. 12.  There are also some serious critical observations by scientists that wind up examples of false celebrations on the web. The New Scientist found several stimulating starting points for true mathematical celebrations
13. 13.  http://en.wikipedia.org/wiki/Pi http://en.wikipedia.org/wiki/Pi_Day
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