# Pi: What is It? Pi (π)! Not the type you eat, but the kind you insert in your calculator to solve equations including circles, spheres, and different other shapes.

A lot of mathematicians and math fans are drawn in calculating pi to as many numbers as possible. The Guinness World Record for reciting the most digits of pi belongs to Lu Chao of China, who has named pi to more than 67,000 decimal places. The Pi-Search Page website has estimated it (with a little help from a computer program) to 200 million numbers.

### Value

Generally known as 3,14 or 22/7, it is an irrational number, that is commonly represented by the symbol – π.
An irrational number, if you were ever wondering, is the number with decimal places that spiral infinitely with no observable pattern. It cannot be defined by an integer ratio and goes on forever, in other words, known as an infinite decimal.

### Digits

The first 100 numbers of pi are:

3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 58209 74944 59230 78164 06286 20899 86280 34825 34211 7067

### History

The symbol of pi is in fact a letter in the Greek alphabet. In both English and greek this letter is spoken simply as Pron.[Pie] Popularizing this fact, a man of the past known as Leonard Euler, assigned the ratio of the circle’s diameter to its circumference as pi.

There is still some dispute about where it was used for the first time. Some believe that the Egyptians because the assembly of their pyramids leaves evidence of the architects’ probable knowledge of pi. Some think the old Babylonians are the ones that stumbled upon and used it …

Let’s get ahead in history, where things get more clearer. The first recorded algorithm for precisely calculating the value of pi, was made by a man called Archimedes. He created a method of calculating π by using regular polygons, that were built in within and around the circle. An inscribed shape is a form, that is drawn within another shape, without flexing or altering its dimensions. Archimedes computed upper and lower bounds of pi by creating a regular hexagon inside and outside of the circle, and without fail to double the number of sides until he got a ninety-six sided regular polygon.

Zu Chongzi of China determined pi to be 355/113, though how he got this number is a mystery, as his work disappeared. British mathematician William Jones started to use it with the symbol (π) in the 1706. He used 3.14159 as the number for pi. ### Pi r squared.

In basic mathematics, pi is applied to find area and circumference of a circle. Pi is applied to find the area by multiplying the radius squared times pi, or. So in trying to discover the area of a circle with a radius of 3 centimeters, π32 = 28.27 cm. Because circles are typically found in nature and are usually used in other mathematical equations.

Story Source

The above post was made from the following materials:
http://www.angio.net/…
https://en.wikipedia.org/…

1. Clarita Imhoff
1. Scorpio