PM+-+6

PM - 6

Hun?---What is pi?
Here are some external links that talk about pi: [|This will teach you about pi from another wiki page.] [|This will also help you understand it better.] Pi is 3.141592653589793238462643383279502884197169............and so on and so for. Pi is an irrational number, which mean it never will end and never will be repeat, AND it will never ever become a fraction.!!! Pi is from greek language. So, you want to know who invented the pi? Let us travel 4,000 years in the past. That is when pi started. Some early people thought that the pi was 3, 3.125, or 3.1605. Archimedes thought pi was between 3 1/7 and 3 10/71. Zu Chongzhi (a chinese person) thought that pi was 335/113. In the 1700's, William Jones use the greek letter pi. Here is a picture about pi. Well, pi is an irrational number. It is used to help find the circumference of a circle, area of a circle, surface area and volume of cylinder, cone, sphere, and other basic circular objects. Try this to help you figure out exactly what pi is. First, you need a disk, a long string, a pencil, a ruler, a large paper, a scissor, and a thinking brain that is on. Next, use a pencil, draw two up and down straight lines. One that is exactly left of the disk and the other exactly right of the disk. Please mark the left line '0'. The space between them is suppose to be the diameter of the disk. Then, use the right line as the left line and draw another line so the space between them is the diameter of the disk. Do this two more times. After that, put a string around the disk completely and use a scissor to cut off the remaining piece of string off. Last, straight up the string so that it start at the straight line that is marked '0' and it is from exactly left to right. The rightest point should be between the third line the string passes and the last line you draw. The rightest point of the line is pi.(Or somewhere near pi. Make sure you've done each step as best as you can or the rightest point is way off pi.)Use this instruction to find if you done it correctly: [|Use the image that said,"When a circle's diameter is 1, its cumference is pi."]

** __What formulas use pi?__ ** Pi is used in many formulas. Some are the area of a sphere which is 4 x pi x r x r, volume of a sphere is 4/3 x pi x r x r x r, Circumference of a circle is 2 x pi x r, the volume of a cylinder is pi x r x r x h, and varios other formulas, most of them involving circular shapes. Pi is bascially the ratio of a a circle's circumference divided by its diameter. The ratio for any circle is pretty much the same: about 3.14. You can prove it by doing some fun experimenting at home. Look for some circular objects at home like a CD or a pop can or even a pie! First, measure the widest part of the object to get the diameter. Next, get some tape or string and measure the outside edge of the circle. That gives you the circumference of the pop can or pie. Once you have those 2 pieces of information, get your calculator and divide the length of the tape by the diameter. You should get an answer around 3.14 for any circular object you measure. I did it a couple of times and got around that number. Pretty cool.......
 * __How do you calculate [[image:http://mathforum.org/dr.math/faq/pi3.gif]]?__**

** __Odd facts about pi__ ** The simplest fact about pi is that it is the ratio of the circumference of a circle to the diameter. Pi has so many digits that you can find certain number patterns in it ( like your birthday ). [| Click here]to try it. __Pi is an irrational ( never ending, non-repeating ) number.__

__**Other Interesting Facts About Pi**__ In 1706, a Welsh math expert named William Jones selected the Greek letter for the ratio of a circle's circumference to its diameter. Pi is the 16th letter in the Greek alphabet. Most people think that a circle dosen't have corners, but it really has unlimeted number of corners. You would not find a 0 in the first 31 digits of pi. If you were to print a billion decimals of pi in an ordinary print font, it would stretch from NYC to Kansas. In 1949, it took over 70 hours to calculate 2037 decimal places of pi using the ENIAC, one of the first computers.

Check out these links for more facts about pi: [|www.buzzle.com/articles/interesting-facts-about-pi.html] [|www.howstuffworks.com/pi] www.joyofpi.com/**pifacts**.html



Get it? High Pi'sand their using only 3 fingers Ha! Ha!