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pi
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pi

Ratio of the circumference of a circle to its diameter. Pi is an irrational number: it cannot be expressed as the ratio of two integers, and its expression as a decimal never terminates and never starts recurring. The value of pi is 3.1415926, correct to seven decimal places. Common approximations to pi are 22/7 and 3.14, although the value 3 can be used as a rough estimation.

For example, a piece of string tied around the circumference of a mug will measure approximately three times the diameter of the mug.

Pi is also a transcendental number (a number that cannot be expressed as a root or as the solution of an algebraic equation with rational coefficients). This was proved in 1882 by German mathematician Ferdinand von Lindemann, and it means that from a line segment drawn to represent the diameter of a circle it is impossible to construct another straight-line segment to represent the circumference of the circle using straight edge and compasses only.
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Whereas Newton labored to calculate 16 digits of pi, for instance, the current computer-assisted record is more than 1 trillion digits (Math Trek, Science News Online: http://www.
Math lab: computer experiments are transforming mathematics by Klarreich, Erica / Science News
PHOENIX -- Pi is one of mathematics most intriguing numbers and teachers, students, parents and others are encouraged to take time out to celebrate the wonders of pi on and near November 10th, 2007, the 314th day of the year which corresponds to the first three digits of pi (3.
Fall Semester Celebration of "Pi Across America" Targets November ... by Business Wire
14159265, the decimal digits of pi run on forever, and there is no discernible pattern to ease the task.
Pi a la Mode by PETERSON, IVARS / Science News
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