π (Pi) Approximation Day

By Lindsay Roseberry, Reference Department

pi-151602_960_720Pi Approximation Day is always celebrated on July 22; this year it’s on a Friday. Why you ask? Because the fraction 22/7 is used as a common approximation of π. The number π is a mathematical constant that is the ratio of a circle’s circumference to its diameter and is approximately equal to 3.14159…. π (Pi) Day is celebrated by mathematicians, geeks and everyone else on March 14—3.14, get it?) It has been represented by the π, a Greek letter for P and pronounced pi, since the mid-18th century. Because π is an irrational number, it can’t be shown as a fraction, such as ½, ¼ or 3/16. Consequently, its decimal representation never ends and never settles into a permanent repeating pattern.

A fraction represents a part of a whole or, more generally, any number of equal parts, describing how many parts of a certain size there are, for example, one-half, eight-fifths, three-quarters. A simple fraction consists of an integer numerator, displayed above a line (or before a slash), and a non-zero integer denominator, displayed below (or after) that line.

5525295088_393b010f76_bAn approximation is a mathematical and scientific term used to describe anything that is very near to but not exactly equal to something else. (In English, we’d use the word roughly or almost.)

Want to celebrate π Approximation Day?

Eat pie, any kind will do. See how many slices you can make. Try another mathematical problem of how to get the first slice out without making a mess. This will take much experimentation!
Or eat something round if you don’t like pie. Pizza anyone??

Pi_pie2Interesting Books in our library about Pi or π:

  • How to Bake Pi: An Edible Exploration of the Mathematics of Mathematics (501.1 CHE)
  • Raspberry Pi for dummies (004.165 COO)
  • Adventures in Raspberry Pi (J 004.1675 PHI, at Bethesda Branch)
  • Raspberry Pi for Kids for Dummies (J 004.165 WEN)
  • Why Pi? (J 530.8 BAL)

Sources:

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About WCPLtn

The Williamson County Public Library System seeks to meet the recreational, educational, and information needs of county patrons through: a significant collection of digital and print materials housed at a network of countywide locations headquartered in Franklin; extensive personal computer and related technology; and diverse and interesting programs targeted to various age groups.

Posted on July 22, 2016, in History, Hot Topics and tagged , , , , . Bookmark the permalink. Leave a comment.

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