# Category: Pi

## Pi Day At Cherry Hill Mathnasium

What is Pi Day?

Here is how it is described in WikipediaPi Day is an annual celebration commemorating the mathematical constant π (pi). Pi Day is observed on March 14 (or 3/14 in the U.S. month/day date format), since 3, 1, and 4 are the three most significant digits of π in the decimal form. In 2009, the United States House of Representatives supported the designation of Pi Day.

Since Mathnasium of Cherry Hill isn’t open on the Fridays, we celebrated Pi Day one day early, but the children didn’t seem to mind!

You may be asking, “what is Pi?” The Scientific American website defines it as:

Succinctly, pi–which is written as the Greek letter for p, or –is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle’s size, this ratio will always equal pi. In decimal form, the value of pi is approximately 3.14. But pi is an irrational number, meaning that its decimal form neither ends (like 1/4 = 0.25) nor becomes repetitive (like 1/6 = 0.166666…). (To only 18 decimal places, pi is 3.141592653589793238.) Hence, it is useful to have shorthand for this ratio of circumference to diameter. According to Petr Beckmann’s A History of Pi, the Greek letter was first used for this purpose by William Jones in 1706, probably as an abbreviation of periphery, and became standard mathematical notation roughly 30 years later.

You can see their whole article by clicking here.

So while we mathematicians love celebrating numbers, we also love playing with words and having some tasty food while doing it!

Here’s hoping you have a great Pi Day!

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## What’s The Story With Pi?

I thought I’d try something a little different today and share a video podcast on the subject of Pi!

If you’ve ever wondered about the term and where it came from and even what it stands for, then we’ve got the answer for you!

So sit back, relax for a couple minutes and watch this nice podcast on the subject of Pi.

There you go … you’re now up-to-snuff on the term Pi.

Hope you all enjoyed that.

Have a great day!

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## American Pi: US Population Passes 3.14 Hundred Million

Here’s a great article from MSNBC.com!

By Megan Gannon News editor
updated 8/14/2012 6:54:24 PM ET

Math geeks everywhere observe Pi Day on March 14. But Aug. 14, 2012, is also a special day for the beloved and never-ending irrational number.

Just after 2:29 p.m. ET Tuesday, the American population reached 314,159,265, or pi (3.14159265) times 100 million, according to the Census Bureau’s population clock.

“This is a once in many generations event … so go out and celebrate this American pi,” demographer Howard Hogan said in a statement from the Census Bureau.

Pi, or in symbol form, π, is the ratio of the circumference of a circle to its diameter. Computer scientists have calculated billions of digits of pi, starting with 3.14159265358979323. But because no recognizable pattern emerges in the succession of its digits, we could continue calculating the next digit, and the next, and the next, for millennia, and we’d still have no idea which digit might emerge next.

Pi has long fascinated mathematicians, with some of the greatest thinkers putting their noggins to the task of calculating it. Perhaps the first to try his hand at pi was Greek mathematician and scientist Archimedes who in the third century B.C. is said to have determined the number fit somewhere between 223/71 and 22/7, or roughly 3.141 and 3.143.

Later, German-born mathematician Ludolph van Ceulen reportedly calculated pi out to 35 decimal places. His pi-pride can still be seen, as he had the numbers engraved on his tombstone. With buff computers, scientists have calculated pi to more than 10 trillion decimal places, according to educator Ron Hipschman, who has helped organize Pi Day celebrations since they began at the Exploratorium science museum in San Francisco, Calif.

While today may have mathematicians elated, grounded statistics suggest U.S. population growth has slowed recently. For instance, between 2000 and 2010 (April 10), the U.S. resident population increased by 9.7-percent, compared with a 13.2 percent increase documented between 1990 and 2000, according to the Census Bureau.

On Oct. 31, 2011, the world population hit its 7 billion mark, with a whopping 10 billion individuals expected to reside on Earth by 2100.