The number Pi written on a blackboard

The number Pi written on a blackboard

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Credit: RICHARD WAREHAM FOTOGRAFIE/SCIENCE PHOTO LIBRARY

Caption: Pi. Pi, a Greek letter, is the symbol used in mathematics to represent the ratio of the circumference of a circle to its diameter. This ratio is a constant with a value of approximately 3.14159. Pi has been calculated to over one trillion digits beyond its decimal point. As an irrational and transcendental number, it will continue infinitely without repetition or pattern.

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