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.
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.
”Pi Day” is celebrated on March 14 (which was chosen because it resembles 3.14). The official celebration begins at 1:59 p.m., to make an appropriate 3.14159 when combined with the date