1. March 14 (03/14): International Pi Day

2. What is Pi?  Pi is represented by the Greek symbol  This symbol is used because it is the first letter of the word perimeter in Greek  It is the symbol to describe the ratio between the circumference of a circle and its diameter

3. Ratio of Diameter to Circumference

4. History of Pi  The symbol was first used in 1706  Pi is an irrational number that will continue into infinity without repeating  With computer technology, Pi has now been calculated to 5 trillion digits past the decimal place

5. Practical Pi Number  Since Pi “goes on forever” we use a more practical approximation when putting it in formulas: 3.14  The formula of an area of a circle is A = r 2 (r = radius) and the number 3.14 would be used for this calculation

6. Playing with Pi  For calculations where a lot of precision is required there are several acceptable “sizes” of pi: 10 digits, 12 digits, or 50 digits  π = 3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510

7. Pi Records:  Guinness Book of Records for Reciting Remembered Digits of Pi Without Error: 67,890 digits, by a 24-year-old graduate student from China. It took him 24 hours and 4 minutes to recite to the 67,890th decimal place of π without an error.

8. Pi Videos  Pi Song: http://www.youtube.com/watch?v= VqpWETqoD5Q http://www.youtube.com/watch?v= VqpWETqoD5Q  Reciting Pi Eminem Style: http://www.youtube.com/watch?v= NBqVvAU-gdg http://www.youtube.com/watch?v= NBqVvAU-gdg