# Geometric Illustration of Machin-Like Formulas

Initializing live version

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram Player or other Wolfram Language products.

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 the determination of Machin-like formulas for computing the number .

[more]
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

## Snapshots

## Details

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

## Permanent Citation