The Topic:

Easier - Pi sounds like pie and is equal to about 3.1416. In math, this is the ratio of the circumference of a circle to its diameter. In other words, pi is a number that equals the quotient of the circumference of a circle divided by its diameter. Many people celebrate pi by holding a Pi Day on March 14th or 3/14.
Harder - The Greek letter pi represents the number by which the diameter of a circle must be multiplied to obtain the circumference. Pi is an irrational number. That is, it cannot be written as a simple fraction or as an exact decimal with a finite number of decimal places. However, you can increase the number of digits until you reach a number as near to pi as needed. Mathematicians with computers have calculated pi to millions of decimal places.
Pi is used in several mathematical calculations. The circumference of a circle can be found by multiplying the diameter by pi (c = pi X d). The area of a circle is yielded by multiplying pi by the radius squared (A = pi X r-squared). Pi is also used to calculate the area of a circle, and the volume of sphere or a cone.
Math Library - Pi from The Math Forum, Drexel University
This huge site provides information and links to all kinds of information on the number pi.
Pi Mathematics
Find out the history of this odd number and discover some fun projects and activities you can do with pi.
Related Websites:
2) Finding the Value of Pi
3) History of Pi
4) Joy of Pi by D. Blatner
5) Pi Pages
Ridiculously Enhanced Pi Page from Exploratorium
Here you have information about 'Pi Day', music, beads, and pie!
Web Page Dedicated to Pi
This site has lots of great information on pi and was once featured in an article in the San Francisco Examiner, Partying for Pi by G. Smith.
After visiting lots of the Pi websites, complete one or more of these activities:
Make A Pi Necklace. Find the procedure for constructing your necklace at Making a Pi Necklace by D. Funke.
Complete A Pi WebQuest. Follow or adapt the procedures found at one of the following webQuests:
1) Are You Ready To Celebrate Pi Day? (Grades 5-6) by Z. Unal
2) Celebrate Pi Day (Grade 7) by J. Justice
3) Pi Day 2000 (Grades 7-12) by C. Healy
4) Piece of Pi (Grades 9-12) by P. Roederer
5) Pi In Those Pies (Grades 10-12) by K. Marchisotto
6) Pi Quest (Grades 7-9) by L. Aepelbacher
7) Pi WebQuest (Grades 9-12) by D. Sudall
Locate A Birthday Within Pi. Use the software program at Where is your Birthday in PI? to locate your birthday or other combination of numbers in pi. Other similar 'Pi locaters' are the Pi-Search Page
Organize and hold a Pi Day Celebration. You can find lots of ideas for activities at sites like the Ridiculously Enhanced Pi Page or Middle School Pi Day from Germantown Academy.
Complete the Pi Trivia Game. Try your skill at the Pi Trivia Game, a quiz of 25 (given to you 5 at a time) fun pi-related questions randomly chosen from a pi question database.
Send A Pi Greeting eCard. Go to Pi Day Greeting Cards. Choose and send a card to someone. Or you can send the one card found at Free Pi Day Card.
Write A Pi Day Song. You can find some examples at Pi Day Songs, The Pi Song, or The Pi Song. Or you may just want to sing those!
Create Some Pi Art. Design and complete a pi poster. Display your completed work.
Websites By Kids For Kids
Dale's Pi Page by D. Winham
Here you find facts, news, history, notes, digits, songs, jokes, charts, poems, links and a program for pi.
More Pi Pages
Archimedes and the Computation of Pi from University of Utah
Learn more about Archimedes (approximately 285---212 B.C.), the famous ancient Greek mathematician and inventor.
Related Websites:
2) Archimedes' Approximation of Pi
3) Archimedes Constant
Digits of Pi
This site provides pi to 10,000 digits and 50,000,000 digits.
Frequently Asked Questions About Pi from Dr. Math at the Math Forum
What is pi? Who first used pi? How do you find it? How many digits is it?
Incredible Pi Code from I. Perterson's MathTreck, Mathematical Association of America
This article focuses on codes derived by the substitution of letters of the alphabet for the digits.
Other Related Articles:
2) Eskimo Pi by K. Devlin from the Mathematical Association of America
3) Passion for Pi by I. Peterson from the Mathematical Association of America
4) Story of Pi by L. Mudehwe
5) Slice of Pi, Anyone? by J. Shepler
Paul's Page of Pi
Most of the content of the site is focused on methods of calculating pi.
Related Websites:
2) Pi Pages
3) Slice of Pi by M.D. Huberty, K. Hayashi, & C. Vang
Pi Irrationality Proof from Robert's Neat Math Pages
This site has a proof of how pi can be defined as an irrational number.
Pi Page by R.W. Clickery
Here you have a 'mere' 50,000 digits of pi, a few software programs for computing, and some quaint facts about pi.
St. Louis Pi Day by T. Chun, C. Daniel, and J.P. Kanoa
Learn how this school celebrates the great number of pi.
Similar Website:
2) Middle School Pi Day by S. Haddad and A.Owens from Germantown Academy
Partying for Pi by G. Smith from the San Francisco Examiner
Here is an online newspaper article about pi and pi day celebration.
Websites For Teachers
Circles in Geometry (Grades 4-6)
Grade school geometry doesn't have to get into a detailed lesson on pi to communicate the basics of this constant.
Chronological History of Pi with Developmental Activities in Problem Solving (Grades 7-10) by A.P. Solli from Yale-New Haven Teachers Institute
The unit begins with a historical development of pi and proceeds with examples of activities to help students develop a deeper appreciation of the mathematical value of pi.
Discovering Pi (Grades 5-7) by J. Eckley from AskERIC
This activity allows students to discover why pi works in solving problems dealing with finding circumference.
Related Lesson:
2) Introduction to Pi and the Area of a Circle (Grades 5-7) by E.R. Justice
Pi Day Celebration from The Math Forum, Drexel University
Here are some activities you can use for a 'Pi Day' celebration on March 14 (3.14)?
Proving Pi (Grades 8-10) by G.D Williams
This activity has students discovering the pi ratio by completing a circles activity.
What is Pi? by M. Kelley
Here you find activities to explore the meaning of pi.
American Pie
geometric shapes
Archimedes Constant
irrational number
constant ratio
ancient Egypt
infinite number
transcendental number
pie chart
double helix
pi cartoon
pi video
'Pi Day'
1:59 p.m. March 14
Created by Annette Lamb and Larry Johnson, 2/02.