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Dictionary.com's Definition of pi - Mathematics. A transcendental number, approximately 3.14159, represented by the symbol  , that expresses the ratio of the circumference to the diameter of a circle and appears as a constant in many mathematical expressions.
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The record has been broken! - The record has been broken! In September, 1999, Dr. Kanada of the University of Tokyo calculated 206,158,430,000 decimal digits of pi (approx.3*2^36). |
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Pi and Atmospheric Pressure - Jonathan Bradshaw points out that standard atmospheric pressure is defined to be P= 0.101325 MPa (This is a human-defined value, which is approximately the average pressure at sea level.) Curiously, if you take the square root of this number and then divide 1 by the result (the reciprocal of the value), you get 3.14153. |
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Pi and the Length of Rivers - From Fermat's Enigma, by Simon Singh - "Professor Hans-Henrik Stolum, an earth scientist at Cambridge University has calculated the ratio between teh actual length of rivers from source to mouth and their direct length as the crow flies. Although the ratio varies from river to river, the average value is slightly greater than 3, that is to say that the actual length is roughly three times greater than the direct distance. In fact the ratio is approximately 3.14, which is close to the value of the number pi... The ratio of pi is most commonly found for rivers flowing across very gently sloping planes, such as those found in Brazil or the Siberian tundra." |
