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# Pi Day

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by

## Dawn Marsh

on 4 November 2013

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#### Transcript of Pi Day

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
Pi......It's a magical number!
What is the Circumference
of the Earth?

Interesting Factoid #1
Regarding Pi

Pi is the most recognized mathematical constant in the world. Scholars often consider Pi the most important and intriguing number in all of mathematics.
Interesting Factoid #2
Regarding Pi
In the Star Trek episode “Wolf in the Fold,” Spock foils the evil computer by commanding it to “compute to last digit the value of pi.”
Interesting Factoid #3
Regarding Pi
In the Greek alphabet, π (piwas) is the sixteenth letter. In the English alphabet, p is also the sixteenth letter.
Interesting Factoid #4
Regarding Pi
Interesting Factoid #5
Regarding Pi
Pi was first rigorously calculated by one of the greatest mathematicians of the ancient world, Archimedes of Syracuse (287-212 B.C.). Archimedes was so engrossed in his work that he did not notice that Roman soldiers had taken the Greek city of Syracuse. When a Roman soldier approached him, he yelled in Greek “Do not touch my circles!” The Roman soldier simply cut off his head and went on his business.
Interesting Factoid #6
Regarding Pi
Some scholars claim that humans are programmed to find patterns in the world because it’s the only way we can give meaning to the world and ourselves. Hence, the obsessive search to find patterns in π.
Interesting Factoid #7
Regarding Pi
In 2002, a Japanese scientist found 1.24 trillion digits of pi using a powerful computer called the Hitachi SR 8000, breaking all previous records.
Interesting Factoid #8
Regarding Pi
If you like, you can calculate the Earth’s circumference yourself. The formula for calculating the circumference of a sphere is 2 x pi x radius. So, the radius of the Earth is 6371 km. Plug that into the formula, and you get 2 x 3.1415 x 6378.1 = 40,074. It would be more accurate if you use more digits for pi.
A mysterious 2008 crop circle in Britain shows a coded image representing the first 10 digits of pi.
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