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Pi Approximation Day is observed on July 22 (with 22/7 reflected as the day/month in date format), the fraction 22/7 is a common approximation of π — accurate up to two decimal places (3.14).

In honor of Pi Approximation Day we've compiled 3 of our best-selling Pi topic issues from our archive. Plus a FREE Bonus Issue: Beyond Einstein.

This package includes:

Scientific American May 2003: A Digital Slice of Pi
The new way to do pure math: experimentally
Scientific American July 1960: Mathematical Games
Incidental information about the extraordinary number pi
Scientific American February 1988: Ramanujan and Pi
Some 75 years ago an Indian mathematical genius developed ways of calculating pi with extraordinary efficiency. His approach is now incorporated in computer algorithms yielding millions of digits of pi
Plus Free Bonus Issue!
Scientific American September 2004 Issue: Beyond Einstein
An entire Scientific American issue dedicated to Albert Einstein

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