Hey Koby, What do you get if you divide the
circumference of a jack-o-lantern by its diameter?
Pumpkin Pie!
When most people think of pie they think of
this dessert.
However pi also refers to the math symbol
that is associated with the circumference
and diameter of 
a circle
The 
known 
users of pi are the Babylonians who estimated
pi to 3, however from 1900-1680 BC they began
using 3.125.
In 1650 BC the Egyptians found 3.141592 as
their estimation.
One of the first calculations of PI was used
by Archimedes of Syracuse.
He used Pythagorean theorem with inscribed
and circumscribed polygons on a circle.
His estimation was between 3 and one seventh
and 3 and ten seventy-first.
Some famous mathematicians that calculated
PI by hand were
Ludolph Van Ceulen who found 36 digits about
1600.
Then about 1870 William Shanks found 707 digits,
but was found to have made an error on digit
527.
Here are a few other interesting facts about
PI
In 1706, William Jones began using the symbol
for PI because it referred to the symbol for
p in the Greek alphabet.
He used p in reference to the perimeter or
the circumference of a circle.
PI day is celebrated on March 14 at 1:59 representing
3.14159, which also happens to be Albert Einstein's
birthday.
PI has also been referred to as circular constant,
Archimedes constant, and Ludolph's number.
A couple of recent happenings in the PI world
have included:
Chao Lu who set a world record for reciting
67,890 places in 24 hours in 2005.
Also in 2011, Alexander Yee and Shigeru Kondo
used a computer to calculate PI to ten trillion
digits.
I hope you have enjoyed these interesting
facts about the history pi and will celebrate
its creation next March 14.
