What's the meaning of pi?

Question

Why did the person who created pi create pi? It's just a number. Why would he/she make a new name for 3.14?

Answer 1

Pi isn't just a random number someone decided to name. It's a tool used to solve many things in mathematics. For example, it was pi multiplied by the diameter of a circle equals the circumference, and pi multipled by the radius of a circle squared gives the area.

Pi is not 3.14, that is the rough estimation people use. Pi is actually an irrational number (meaning it cannot be expressed as any sort of fraction, it does not terminate or repeat).

Answer 2

Pi ( π ) is the sixteenth letter of the Greek alphabet. It was selected as a convenient shorthand notation to designate the fixed ratio between the circumfrernce of a circle and the diameter of that circle. It is a constant, yet never ending number which some people with nothing better to do have calculated to hundreds of decimal places. (But I don't know how.) For mostl practical purposed the approximate value of 3.14 or else 3.1416 will usually suffice.
There are a couple jokes which revolve around the similarity between "Pi" and "Pie". (Don't ask)

Answer 3

Pi is the ratio between the circumference and the diameter of a circle. 3.14 is just an estimation. The real Pi is endless.

Answer 4

pi is the ratio of the circumference of any circle to its diameter. pi is an irrational number and cannot be expressed as a fraction or an exact decimal.

pi does not = 3.14 as you suggest. As I said above, its value cannot be expressed exactly.

Answer 5

The circumference of a circle divided by its diameter = pi

Answer 6

Because that particular number has a specific meaning... its a universal constant of nature. It is just a number... but not just any number... its pi

Answer 7

http://mathforum.org/library/drmath/view/59075.html