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# Pi Day 2013

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## Kristina Brantley

on 13 March 2013

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#### Transcript of Pi Day 2013

3/14/2013 Happy Pi Day! What is Pi? Why do we care about pi? A Brief History of pi The Indiana Pi Bill Pi in Books, Movies, & TV More Interesting Pi Facts What Does Pi Sound Like? pi is involved in everything circular! c. 1650 BC - pi first appears in the Rhind Papyrus written by a scribe named Ahmes In 1897, Edwin J. Goodwin, a physician and mathematician in Indiana claimed he could solve the squaring the circle problem, but to make his demonstration valid, he needed pi to equal 3.2. To account for this, Indiana drafted the "Pi Bill" to legally change the value of pi to 3.2. 16th letter of the Greek alphabet Irrational: cannot be expressed as a fraction of two whole numbers - this also means that it goes on forever and never repeats! Transcendental: cannot be a root of any polynomial with integer coefficients pi also appears frequently in physics, probability, statistics, engineering, and other fields And Happy Birthday to Albert Einstein! March 14, 1879 - April 18, 1955 Ahmes wrote:
"Cut off 1/9 of a diameter and construct a square upon the remainder; this has the same area as the circle" First attempt to "square the circle," which is to construct a square having the same area as a given circle. less than 1% error c. 1400-400 BC - pi appears in the Old Testament I Kings 7:23

"Also he made a molten sea of ten cubits from brim to brim, round in compass, and five cubits the height thereof; and a line of thirty cubits did compass it round about." I Kings 7:26

"It was a handbreadth in thickness, and its rim was like the rim of a cup, like a lily blossom. It held two thousand baths." I Kings 7:23

"Also he made a molten sea of ten cubits from brim to brim, round in compass, and five cubits the height thereof; and a line of thirty cubits did compass it round about. c. 287-212 BC - Archimedes uses 96-sided polygon 1220 - Leonardo de Pisa figures out pi is 3.141818... 1706 - John Machin calculates pi to 100 decimal places; William Jones introduces the symbol 1737 - Euler popularizes the use of the symbol 1761 - Johann Lambert proves pi is irrational 1882 - Ferdinand von Lindemann proves pi is transcendental 2011 - pi computed to 10 trillion digits Chao recited pi from memory to 67,890 places. It took 24 hrs 4 min and was recorded on 26 videotapes If one billion decimals of pi were printed in ordinary type, they would stretch from New York City to Kansas The website