Pi+Day

** March 14, 2012 **


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= **Pi** = **There are many fascinating numbers in mathematics. One of the most interesting number relationships that you can discover in geometry is that the ratio of the circumference of a circle (the distance around a circle) to the diameter of a circle (the length of a line across a circle that passes through its center) is approximately equal to 3.14 or. This ratio is true for all circles. It is called pi, and is represented by the Greek letter .**



**DID YOU KNOW..........**


 * 1) Pi is the number of times a circle's diameter will fit around its circumference.
 * 2) Most people would say that a circle has no corners, but it is more accurate to say that it has an infinite number of corners.
 * 3) The sequence of digits in Pi so far passed all known tests for randomness.
 * 4) The fraction (22 / 7) is a well used number for Pi. It is accurate to 0.04025%.
 * 5) Another fraction used as an approximation to Pi is (355 / 113) which is accurate to 0.00000849%
 * 6) A more accurate fraction of Pi is(104348 / 33215). This is accurate to 0.00000001056%.
 * 7) Pi occurs in hundreds of equations in many sciences including those describing the DNA double helix, a rainbow, ripples spreading from where a raindrop fell into water, superstrings, general relativity, normal distribution, distribution of primes, geometry problems, waves, navigation....
 * 8) There is no zero in the first 31 digits of Pi.
 * 9) Pi is irrational. An irrational number is a number that cannot be expressed in the form (a / b) where a and b are integers.
 * 10) In 1991, the Chudnovsky brothers in New York, using their computer, m zero, calculated pi to two billion two hundred sixty million three hundred twenty one thousand three hundred sixty three digits (2, 260, 321, 363). They halted the program that summer.
 * 11) The Babylonians found the first known value for Pi in around 2000BC -They used (25/8).
 * 12) The first person to use the Greek letter Pi was Welshman William Jones in 1706. He used it as an abbreviation for the periphery of a circle with unit diameter. Euler adopted the symbol and it quickly became a standard notation.
 * 13) <span style="font-family: 'Comic Sans MS',cursive;">The old memory champion was Hideaki Tomoyori, born Sep. 30, 1932. In Yokohama, Japan, Hideaki recited pi from memory to 40,000 places in 17 hrs. 21 min. including breaks totaling 4 hrs. 15min. on 9-10 of March in 1987 at the Tsukuba University Club House.
 * 14) <span style="font-family: 'Comic Sans MS',cursive;">The Pi memory champion is Hiroyoki Gotu, who memorised an amasing 42,000 digits.
 * 15) <span style="font-family: 'Comic Sans MS',cursive;">Pi is the 16th letter of the Greek alphabet.
 * 16) If you take 10 million random digits, statistically on average you would expect 200 cases where you get 5 digits in a row the same. If you take 10 million digits of Pi, you get exactly 200.
 * 17) If a billion decimals of pi were printed in ordinary type, they would stretch from New York City, to the middle of Kansas.
 * 18) The old world record for computation of the most digits of pi was achieved in September/October 1995 by Yasumasa Kanada at the University of Tokyo. It took 116 hours for him to compute 6,442,450,000 decimal places of Pi on a computer.
 * 19) Taking the first 6,000,000,000 decimal places of Pi, this is the distribution:0 occurs 599,963,005 times,1 occurs 600,033,260 times,2 occurs 599,999,169 times,3 occurs 600,000,243 times,4 occurs 599,957,439 times,5 occurs 600,017,176 times,6 occurs 600,016,588 times,7 occurs 600,009,044 times,8 occurs 599,987,038 times,9 occurs 600,017,038 times.
 * 20) At position 763 there are six nines in a row. This is known as the Feynman Point