MARTIN KRZYWINSKI / SCIENCE PHOTO LIBRARY MARTIN KRZYWINSKI / SCIENCE PHOTO LIBRARY
Pi number wheel representation, illustration. Pi as a path traced by links between successive digits. Each digit is assigned a segment (0-9). For example, the sequence '14' is drawn as a link between segment 1 and segment 4. The number of transitions between digits is summarized in a series of circles placed outside the links. Pi (the sixteenth letter of the Greek alphabet) is the symbol used in mathematics to represent the constant of the ratio of the circumference of a circle to its diameter. It is a crucial element of periodic functions and is found in many formulae in trigonometry and geometry. The value of this ratio is approximately 3.14159. It has been calculated to over one trillion digits beyond its decimal point, though as an irrational and transcendental number it continues infinitely without repetition or pattern. For a labelled variant of this image, see C038/4613 to C038/4615.
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