PI

Draw a circle with a radius of 1.
The distance half way around the circle
 is 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 circle) will be Pi
 
Pi 
Pi (the symbol is the Greek letter π) is:
The ratio of the Circumference 
to the Diameter 
of a Circle.
Category:Circles
Category:Irrelevant