Pi is a mathematical constant approximately equal to 3.14159. It is the ratio of a circle's circumference to its diameter and is commonly represented by the Greek letter π. Archimedes first calculated pi by developing a method to inscribe polygons inside circles and estimating their areas, known as the method of exhaustion. Throughout history, many mathematicians have worked to calculate more decimals of pi, which is irrational and non-terminating. Pi is now celebrated on March 14th in honor of its digits 3.14.

1. NUMBER
Pi

3. ~It’s defined as the ratio of the volume and
circle diameter.
~Pi is also known as Archimedes' constant or
Ludolf's number.
~It is written in a small Greek letter (π)and
the mark for the number pi derives from the
Greek word perimeter, which means the
length of the curve that borders a plane.
~The symbol for pi (π) has been used
regularly in it’s mathematical sense only for
the past 250 years.

4. What is Pi in
fact?

5. ~It's a constant. It's irrational. The value
of the number π is rounded to 64
decimal places:
π ≈ 3.14159 26535 89793 23846 26433
83279 50288 41971 69399 37510 58209
74944 5923.
~However, as you know, in mathematics
it is mainly used in the rounded form
3.14 or as a breakdown of 22/7.

6. It’s approximate value is
3.14159. We say that it is
approximate because it has
an infinite number of
decimals, which
mathematicians have been
trying to calculate from
ancient Greece to the
present day.

7. Celebrating the
number Pi

8. ~"Pi Day" is celebrated on
March 14th (Albert
Einstein’s birthday). The
official celebration
begins at 1:59 p.m., to
make an appropriate
3.14159 when combined
with the date!

9. ~ Today there are lot of different types of arts
that glorify Pi : pi - music, pi - poetry, pi - film ...
~Also, how much it has been intriguing to the
public for centuries, the best shows celebrations
in his honor.
~Otherwise, the day of the Pi number is marked
in various ways, including competition in eating
pies and discussing the significance of the
number π. Some schools also organize
competitions in which students are trying to
remember as much as possible decimals of the Pi
number.

10. ~The first one who decided to celebrate the
day of the number Pi was physicist Larry
Shaw in 1988.
~He circled with his colleagues in a circular
hall at the Exploratorium Museum in San
Francisco, after which they ate fruit cakes.
~Later years they ate pizza, and the only
thing that mattered when they choosed
meals, was that it was a round shape.

13. How did
Archimedes
calculate this?

14. ~He developed a method of describing the
correct polygons around the circle trying to
calculate the circle area.
~This method is known as the method of
exhaustion.
~What does this have to do with the number
π ? So, the more sides it has, the proper
polygon is the closer to the circle. And so
Archimedes started to transform those sides
in line.
~Exhaustion reached ninety-sixth and more
precise estimates for the number π.

15. Number Pi
history

16. ~The Pi symbol has already entered history in ancient
Egypt, since the earliest records referring to this number
were found on the sheets of papyrus that occurred around
1650 BC.
~However, the first who actually calculated the number Pi
was Archimedes, but since he was not yet aware of the
decimals at that time, he expressed it in the form of a
fragment. Since then, until the beginning of the 17th
century, all mathematicians who calculated the number π
(and there were many) made it to Archimedes' method.
~Since then, many mathematicians, with more or less
success, have dealt with calculating the decimals of the
number π. Everyone wanted to calculate it as precisely as
possible, until the last decade.
~ It was only later understood that this was impossible
because it was infinite.

17. Archimedes

18. In math, it was introduced by William Jones
in 1707, and was popularized by Leonard
Euler in 1737.

19. Interesting facts

20. 1.To recite 6.4 billion decimals of the pi
number, you would need 133 years of talking
without pausing.
2.Some people believe that pi contains
answers to questions about the infinity of the
universe.
3.The record of the most decimated number
of Pi is held by Fabrice Bellard. He calculated
a pi to 2.7 trillion decimals on a regular
desktop computer.

21. 4.In the first hundred thousand
decimals of the number pi, number
one is the most often repeated
number.
5.The world record in the number
of memorable decimals of the pi
number hold Lu Chao.
~According to the Guinness Book of
Records, he remembered 67,890
digits, which took him 24 hours and
4 minutes to recite.

22. Did you know
that 3.14
percent of the
sailors are
actually Pi-rats?