Pi is an irrational number that is approximately 3.14159. It is the ratio of a circle's circumference to its diameter and appears in many formulas in geometry and engineering. Pi has been calculated to over 62 trillion digits and continues infinitely without repetition or pattern. Throughout history, mathematicians have worked to better approximate Pi using formulas and calculations. Pi is ubiquitous in applications involving circles from drawing and design to physics, technology, and space exploration.

1. PI
π
3.1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164
0628620899 8628034825 3421170679 8214808651 3282306647 0938446095 5058223172
5359408128 4811174502 8410270193 8521105559 6446229489 5493038196 4428810975
6659334461 2847564823 3786783165 2712019091 4564856692 3460348610 4543266482
1339360726 0249141273 7245870066 0631558817 4881520920 9628292540 9171536436
7892590360 0113305305 4882046652 1384146951 9415116094 3305727036 5759591953
0921861173 8193261179 3105118548 0744623799 6274956735 188575272 4 8912279381
8301194912 9833673362 4406566430 8602139494 6395224737 190702179 8 6094370277
0539217176 2931767523 8467481846 7669405132 0005681271 4526356082 7785771342
7577896091 7363717872 1468440901 2249534301 4654958537 1050792279 6892589235
4201995611 2129021960 8640344181 5981362977 4771309960 5187072113 4999999837
2978049951 0597317328 1609631859 5024459455 3469083026 4252230825 3344685035
2619311881 7101000313 7838752886 5875332083 8142061717 766914730 3 5982534904
2875546873 1159562863 8823537875 9375195778 1857780532 1712268066 1300192787
6611195909 2164201989 3809525720 1065485863 2788659361 533818279 6 8230301952
0353018529 6899577362 2599413891 2497217752 8347913151 5574857242 4541506959

2. What is Pi?
π
 Pi is one of the longest numbers
ever computed, second only to “e”
(another IRRATIONAL number
with a value of 2.7182818284590)
It never repeats like the decimal
values of 5/7=7142857142857
• Pi is always the same number,
Regardless to the size of the circle.

3. Pi history
π
 The early Babylonians and Hebrews used “3”as a
value for Pi.
 Later, Ahmed, an Egyptian found the area of a circle .
 Down through the ages, countless people have
puzzled over this same question, “What is Pi?
 The Greeks found Pi to be related to cones, ellipses,
cylinders and other geometric figures.

4. Pi history
π
 From 287 - 212B.C. there
lived Archimedes, who inscribed
in a circle and circumscribed
about a circle, regular polygons.
Circumscribed Inscribed

5. Some people became famous by discovering ways to calculate
Pi
π
 LEIBNITZ (1671) Pi= 4(1/1-1/3+1/5-1/7+1/9-1/11+1/13+...)
 WALLIS Pi= 2(2/1*2/3*4/3*4/5*6/5*6/7*...)
 MACHIN (1706) Pi=16(1/5- 1/(3+5^3) +1/(5+5^5) -1/(7+5^7)+...)
x - 4(1/239 -1/(3*239^3) + 1/(5*239^5)-...)
 SHARP (1717) Pi= 2*Sq.Rt(3)(1-1/3*3 + 1/5*3^2 - 1/7*3^5...)
 EULER (1736) Pi= Sq.Rt(6(1+1/1^2+1/2^2+ 1/3^2...))
 BOUNCKER Pi= 4 --- 1+1 --- 2+9 --- 2+25 +...

6. π
 In this animation, demonstrates the idea of Pi

7. Pi in everyday life
π
 We use it for Drawing, machining, plans, planes,
buildings, bridges, geometry problems, radio, TV,
radar, telephones, estimation, testing, simulation,
global paths, global positioning, space science, orbit
calculation, Space ships, satellites, Speedometers at
vehicles… etc.
 Pi is used by every career whether you are a
electrical engineer, statistician, biochemist, or
physicist. Pi is indeed a necessity for life.

8. A world without Pi
π

9. Pi facts
π
 ”Pi Day” is celebrated on March 14.
The official celebration begins at
1:59 p.m. to make an appropriate
3.14159 when combined with the date.
 Albert Einstein was born on Pi Day (14/3/1879) in
Ulm Wurttemberg, Germany.
 Pi goes on for ever
 Decimals have no pattern and don’t repeat.

10. π
The end