*March 14th was PI Day….*

*If you are looking for A Brief History of π * check out the sites below.

http://www.exploratorium.edu/pi/history_of_pi/index.html

http://mathforum.org/t2t/faq/faq.pi.html

# 50 Interesting Facts … http://facts.randomhistory.com/2009/07/03_pi.html

- Pi is the number of times a circle’s diameter will fit around its circumference
- There is no zero in the first 31 digits of Pi
- Pi has 6.4 billion known digits – it would take a person approximately 133 years to recite all of them without stopping
- At position 763 (known as Feynman Point), there are six nines in a row
- Some people believe Pi contains the answers of the universe. (But on some days, a
*slice*of pie holds all the answers to the universe!) - It took nine hours for the Memorized-Digits-of -Pi world record holder to recite over 44,000 digits
- Pi Day (March 14) is also Albert Einstein’s birthday!
- Pi is irrational — no, not like my mother. An irrational number is one that cannot be expressed as a ratio of integers
- Johann Lambert proved Pi is irrational in 1768
- The symbol for Pi (π) has been used regularly for 250 years
- Pi has been studied by the human race for 4,000 years
- Many mathematicians claim that it is more correct to say the a circle has an infinite number of corners than to view a circle as cornerless. Stop and think about that for a second.
- Pi was first calculated by Archimedes of Syracuse. He was reportedly so engrossed in his work that he did not notice when the Roman soldiers conquered the city of Syracuse. When a Roman soldier approached Archimedes, he yelled in Greek “Do not touch my circles!” The Roman soldier quickly cut off his head and moved on.
- If you printed a billion decimals of Pi in ordinary font it would stretch from New York City to Kansas. We recommend you don’t try and print out Pi!

A few March sites….

March Front Page http://nrich.maths.org/public/

March Theme Units http://edhelper.com/March.htm

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