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# Exploring Pi

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## Jamie

on 13 May 2013

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#### Transcript of Exploring Pi

How many diameters could you cut from the circumference? Experiment Time! Everyone should have a cookie, a piece of string, and a napkin.

2) Find the circumference of the cookie by wrapping your piece of string it around the outside edge of the cookie.
4) Take this circumference and lay it out across the cookie, as if it were the diameter line.
5) Cut the string where one diameter length ends. What is Pi? Everyone knows a little bit about pi. 3! This 3 represents the 3 in 3.14 in pi. You can wrap the diameter 3 times around the circumference. Or, if you like to think of it vice versa, the circumference holds the length of 3 diameters. What about the small itty-bitty section that's left? What do you think? That small little section... ...is the .14 in 3.14! The measurement of that little piece goes one forever!

.14159265358979323846264338327950288419716... Jamie Kim ~ period 1 Exploring Pi! But what exactly is it? The History of Pi People have known about pi since as far back as the ancient Babylonians. They calculated the area of a circle by taking the square of its radius radius three times. The first calculation of pi was Archimedes of Syracuse, and he approximated pi to be about 22/7. History of Pi Cntd. Then the Greek symbol π was first used by William Jones in 1706. It was chosen for the "p" as in perimeter of circle. It became more common after Leonhard Euler, a Swiss mathematician , started to use it in 1737. Okay, but... WHAT EXACTLY IS PI? PI is the ratio of a circle's circumference to its diameter. We all know pi as... 3.1415926535... but to understand what that means... Let's see it in front our eyes! It's not just a number! But wait... Finally... 3.14 makes sense to you!
It's the number of diameters that fits on the circumference of a circular object, not just a really cool number that goes on to infinity. Citations Images "Archimedes Thoughtful." Wikipedia. Wikimedia Foundation, 7 Apr. 2013. Web. 9
May 2013. <http://en.wikipedia.org/wiki/Archimedes>.

Diagram of circle. Wpclipart. N.p., 2013. Web. 9 May 2013. <http://www.wpclipart.com/education/geometry/circle/circle_diagram.png.html>.

Value of pi. Live Science. TechMediaNetwork.com, 2013. Web. 9 May 2013.
<http://www.livescience.com/29197-what-is-pi.html>.

Websites "Learn about Pi." Pi Day. 314 Solutions, n.d. Web. 30 Apr. 2013. <http://www.piday.org/learn-about-pi/>.

"A Brief History of π." Pi Day. Exploratorium, 2013. Web. 30 Apr. 2013.
<http://www.exploratorium.edu/pi/history_of_pi/>.
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