# Geometric Illustration of Machin-Like Formulas

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This Demonstration illustrates geometrically some Machin-like formulas for computing the number . A Gregory number is , where is a rational number. Since , Gregory numbers arise in â€¨the determination of Machin-like formulas for computing the number .

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Contributed by: Izidor Hafner (March 2011)

Based on work by : John H. Conway and Richard K. Guy

Open content licensed under CC BY-NC-SA

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J. H. Conway and R. K. Guy,* The Book of Numbers*, New York: Copernicus Books, 2006 pp. 244–247.

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