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Pi (π) 
Draw a circle with a radius 
of 1. 
The distance half way 
around the edge of the 
circle 
will be 3.14159265... a 
number known as Pi 
Or you could draw a circle 
with a diameter of 1. 
Then the circumference (the 
distance all the way 
around the edge of the circle) 
will be Pi 
Pi (the symbol is the Greek 
letter π) is: 
The ratio of the Circumference 
to the Diameter 
of a Circle.
Finding Pi Yourself 
Draw a circle, or use something circular 
like a plate. 
Measure around the edge (the 
circumference): 
I got 82 cm 
Measure across the circle (the 
diameter): 
I got 26 cm 
Divide: 
82 cm / 26 cm = 3.1538...
That is pretty close to π. Maybe if I 
measured more accurately? 
In fact π is 
approximately equal to: 
3.1415926535897932384 
6… 
The digits go on and on 
with no pattern. π has 
been calculated to over 
two quadrillion decimal 
places and still there is 
no pattern to the digits 
Example: You walk around a circle 
which has a diameter of 100m, how far 
have you walked? 
Distance walked = 
Circumference = π × 
100m = 314.159...m 
= 314m
Approximation 
A quick and easy approximation for π is 
22/7 
22/7 = 3.1428571... 
But as you can see, 22/7 is not exactly 
right. In fact π is not equal to the ratio of 
any two numbers, which makes it an 
irrational number. 
A better approximation (but stll not 
exact) is: 
355/113 = 3.1415929... 
(think "113355", then divide the "355" by 
the "113") 
Remembering 
I usually just remember "3.14159", but 
you can also count the letters of: 
"May I have a large container of butter 
today" 
3 1 4 1 5 9 2 6 5 
To 100 Decimal Places
Here is π with the first 100 decimal 
places: 
3.14159265358979323846264338327950288 
4197169399375105820974944592307816 
4062862089986280348253421170679...

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Pie

  • 1. Pi (π) Draw a circle with a radius of 1. The distance half way around the edge of the circle will be 3.14159265... a number known as Pi Or you could draw a circle with a diameter of 1. Then the circumference (the distance all the way around the edge of the circle) will be Pi Pi (the symbol is the Greek letter π) is: The ratio of the Circumference to the Diameter of a Circle.
  • 2. Finding Pi Yourself Draw a circle, or use something circular like a plate. Measure around the edge (the circumference): I got 82 cm Measure across the circle (the diameter): I got 26 cm Divide: 82 cm / 26 cm = 3.1538...
  • 3. That is pretty close to π. Maybe if I measured more accurately? In fact π is approximately equal to: 3.1415926535897932384 6… The digits go on and on with no pattern. π has been calculated to over two quadrillion decimal places and still there is no pattern to the digits Example: You walk around a circle which has a diameter of 100m, how far have you walked? Distance walked = Circumference = π × 100m = 314.159...m = 314m
  • 4. Approximation A quick and easy approximation for π is 22/7 22/7 = 3.1428571... But as you can see, 22/7 is not exactly right. In fact π is not equal to the ratio of any two numbers, which makes it an irrational number. A better approximation (but stll not exact) is: 355/113 = 3.1415929... (think "113355", then divide the "355" by the "113") Remembering I usually just remember "3.14159", but you can also count the letters of: "May I have a large container of butter today" 3 1 4 1 5 9 2 6 5 To 100 Decimal Places
  • 5. Here is π with the first 100 decimal places: 3.14159265358979323846264338327950288 4197169399375105820974944592307816 4062862089986280348253421170679...