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First off Pi is an irrational number it cannot be precisely defined as the ratio of any two whole numbers Second Around 200 BC, Archimedes of Syracuse found that Pi is somewhe…re about 3.14 (in fractions; Greeks did not have decimals). (MORE)

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The symbol Ï was popularized by the Swiss mathematician Leonhard Euler in the early 18th century to represent this ratio.

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pythagoras. he had lots of different theorums, one named after him in fact(pythagorases theorum) he came up wth the symbol from ancient greek drawings.

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In Geometry

has a long and interesting history! (Ancient history--More pi history--A novel way to compute pi--The symbol for pi--Having fun with pi--For more information) That the ra…tio of the circumference to the diameter of a circle is constant (namely, pi) has been recognized for as long as we have written records. A ratio of 3:1 appears in the following biblical verse:.
And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it about. (I Kings 7, 23; II Chronicles 4, 2.).
The ancient Babylonians generally calculated the area of a circle by taking 3 times the square of its radius (=3), but one Old Babylonian tablet (from ca. 1900-1680 BCE) indicates a value of 3.125 for pi. Ancient Egyptians calculated the area of a circle by the following formula (where d is the diameter of the circle):.
This yields an approximate value of 3.1605 for pi. The first theoretical calculation of a value of pi was that of Archimedes of Syracuse (287-212 BCE), one of the most brilliant mathematicians of the ancient world. Archimedes worked out that 223/71 < < 22/7. Archimedes's results rested upon approximating the area of a circle based on the area of a regular polygon inscribed within the circle and the area of a regular polygon within which the circle was circumscribed. Beginning with a hexagon, he worked all the way up to a ploygon with 96 sides! Archimedes's method for approximating the value of pi. (Source: http://www.math.psu.edu/dna/graphics.html#archimedes) The approximate area of the circle lies between the areas of the circumscribed and the inscribed hexagons. .
More pi history: European mathematicians in the early modern period developed new arithmetical formulae to approximate the value of pi, such as that of James Gregory (1638-1675), which was taken up by Leibniz: .
/4 = 1 - 1/3 + 1/5 - 1/7 + . . . . . . . . . . . .
One problem with using this formula to calculate the value of pi is that you would have to add 5 million terms to work out a value of /4 that extends to 6 or 7 decimal places! In 1706, another mathematician named John Machin developed a refinement on Gregory's formula, yielding the formula still used today by computer programmers to compute pi: Using this formula, an Englishman named William Shanks calculated pi to 707 places, a labor of many years, which he published in 1873. (Only 527 places were correct, however!) A novel way to compute pi: An eighteenth-century French mathematician named Georges Buffon devised a way to calculate pi based on probability. Buffon's method begins with a uniform grid of parallel lines, a unit distance apart. If you drop a needle of length k < 1 on the grid, the probability that the needle falls across a line is 2 k /. Various people have tried to calculate pi by throwing needles. Depending on when you stop the experiment, you can obtain a reasonably accurate estimate of pi. You can try Buffon's needle experiment for yourself (virtually) at http://www.angelfire.com/wa/hurben/buff.html Some ants apparently actually use this algorithm to measure the size of potential nest sites! The symbol for pi: was introduced by the English mathematician William Jones in 1706, who wrote: 3.14159 = This symbol was adopted by Euler in 1737 and became the standard symbol for pi. Having fun with pi: Some people are just crazy about pi! There are pi poems . . . There are pieces of music based on the digits of pi . . . There is a web site where you can find your birthday in pi . . . There are people who have memorized 1000+ digits of pi . . . In 1897 the Indiana Legislature tried to legally establish the value of pi . . . Pi has earned a spot in "The Useless Pages"(Ancient history--More pi history--A novel way to compute pi--The symbol for pi--Having fun with pi--For more information (MORE)

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In Algebra

By dividing the diameter of a circle into its circumference which is about 22/7 but the true value of pi is not known as a decimal because its decimal places can go on to infi…nity. (MORE)

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Value of pi was first given by the semi god Krishna in Mahabharata to 32 accurate decimal places .In fact it can be extended more.Archimedes long later used an approximation m…ethod to calculate pi to 4 decimal places see the link below for how to calculate pi to 32 accurate decimal places http://archives.amritapuri.org/bharat/bharat.php (MORE)

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You are probably thinking about Rahmanujan. However, he didn't really "create pi" - God created pi. Nor did he discover it, pi was known well before Rahmanujan. What he did do… was to find some very efficient formulae to calculate pi to many decimal places - formulae that are still used today. (MORE)

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In Algebra

The first person to calculate pi was Archimedes , around 250 B.C. Using the formula: A = pi r^2

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Daniel Tammet. A twenty-something with extraordinary mental abilities, Daniel is one of the world's few savants. He can do calculations to 100 decimal places in his head, and… learn a language in a week. He also meets the world's most famous savant, the man who inspired Dustin Hoffman's character in the Oscar winning film 'Rain Man' This documentary follows Daniel as he travels to America to meet the scientists who are convinced he may hold the key to unlocking similar abilities in everyone. Andriy Slyusarchuk claims to have set a number of records in memorizing large volumes of digital data, sequences of geometrical figures, as well as words and other information. In particular, he claims to have memorized 1 million digits of pi figure. By 2008 he claimed to remember 2,000,000 decimal places of pi, as well as around 7,000 volumes of text. By 2009 the number of volumes remembered increased to 15.000. By June 2009 he claimed to have set a new record by memorizing the first 30 million places of pi, which were printed in 20 volumes of text. Although he did not recite all 30 million digits that he claimed to have memorized, he was able to recite randomly selected sequences from within the first 30 million places of pi. Since reciting 30 million digits of Ï at one digit a second would take almost a year (347 days) if you did it non-stop 24 hours a day, seven days a week, a following approach had been applied to verify the record: during demonstrations Mr. Slyusarchuk is being randomly asked to tell the digits of pi printed on certain pages and locations of the 20 volume printout, which is grouped into orderly arranged tables. He successfully went through this kind of test multiple times. Demonstrations had been witnessed by respectable scientists and heads of sub-departments in Universities. Book of Records of Ukraine (ÐÐ½Ð¸Ð³Ð° ÑÐµÐºÐ¾ÑÐ´ÑÐ² Ð£ÐºÑÐ°ÑÐ½Ð¸) lists the members of commission witnessing his demonstration. [38] They are country-wide recognized scientists on the top positions in National Universities and Institutes. By October 2010 Mr. Slyusarchuk claimed to remember 200 million decimal places of pi. None of his claimed Pi records is accepted by the official Pi World Ranking List [40] or the Guinness Book of Records since no real independent test of his pi knowledge was possible ever. Mr. Slyusarchuk is known for his hypnotic skills as well. In particular, he claims to be able to hypnotize people so as to not feel pain, e.g. when exposed to burns. Another TV show presented him hypnotizing students of L'viv University of Modern Technologies (ÐÑÐ²ÑÐ²ÑÑÐºÐ¸Ð¹ Ð´ÐµÑÐ¶Ð°Ð²Ð½Ð¸Ð¹ ÑÐ½ÑÑÐ¸ÑÑÑ Ð½Ð¾Ð²ÑÑÐ½ÑÑ
ÑÐµÑ
Ð½Ð¾Ð»Ð¾Ð³ÑÐ¹ ÑÐ° ÑÐ¿ÑÐ°Ð²Ð»ÑÐ½Ð½Ñ ÑÐ¼. Ð. Ð§Ð¾ÑÐ½Ð¾Ð²Ð¾Ð»Ð°). Those under hypnotic influence could eat onions believing those were apples. He also demonstrated hypnotizing a salesman in a shop to take a 1 hryvna bill from him, believing this to be 500 Hryvna. Novyi Kanal has hosted a few TV events in which Andriy Slyusarchuk demonstrated many of his extraordinary abilities. The Video recording of the events is available at http://video.novy.tv/video/3/24/9842.html . When trying to show exceptional Chess position memory on TV (memorizing all pieces on 80 boards), he was criticized by a chess master invited to the event (Grigoriy Timoshenko). An article in The New York Times called Slysarchuk "an Illusionist". He was also officially invited to participate in the World Memory Championships, where his feats would have been tested by independent international arbiters. He was promised 40,000 US$ if he broke the accepted memory records, but he refused to go there (MORE)

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It was first introduced by the Welsh mathematician William Jones in 1706 and pi is the 16th letter of the Greek alphabet also it is the 1st letter of the Greek word for perime…ter. (MORE)