what does pi stand for?
78720
Pi is a name given to the ratio of the circumference of a circle to the diameter. That means, for any circle, you can divide the circumference (the distance around the circle) by the diameter and always get exactly the same number. It doesn't matter how big or small the circle is, Pi remains the same. Pi is often written using the symbol  and is pronounced "pie", just like the dessert.
1173792
It's "pi" and pi is an irrational number.  There is no end.
617647
Pi is the ratio of the circumference of a perfect circle and its diameter, C/D. It is an irrational number, meaning, it's decimals is non-repeating and never ending. I can't tell u what come after 3.14 because I do not even bother to remember, just knowing that Pi is roughly 3. But u can easily find what come after 3.14 on the web.
1077315
The square root of pi is approximately 1.772453851.
357016
It means 10 times pi.  If you don't know what pi means, its that wacked up #, you know 3.141..............
85817
various formulas for computing pi:\nhttp://mathworld.wolfram.com/PiFormulas.html\nall sorts of fun stuff with pi here:\nhttp://mathworld.wolfram.com/PiDigits.html
86302
Pi is the ratio of a circle's circumference to its diameter (it's the same for every circle). It's an irrational number, which means that it repeats infinitely, and so far no one has been able to find a pattern in the digits. It's also a transcendental number, which means that it is not possible to construct a polynomial function f with integer coefficients such that f(pi) = 0.\n\nBecause of all that, it's not possible to come up with all the digits of pi, at least not unless someone finds a pattern to them. The world record for most digits of pi calculated is 1,241,100,000,000, which is held by Yasumasa Kanada (or, more accurately, by his computer).\n\nThe formula that Kanada used to calculate pi is large, and kind of cumbersome for anyone but a computer to use. It is, however, very efficient, which is why he used it.\n\nThe simplest formula for calculating pi is to use the arctan series. We know that arctan (pi/4) = 1, by definition of arctan. Using the Taylor Series expansion, we find\n\narctan (t) = t - t^3/3 + t^5/5  - t^7/7 + t^9/9 - ...\n\nThat series does go on forever, but so does pi, and so you can use it to calculate pi/4, by putting in 1 for x:\n\narctan (1) = 1 - 1/3 + 1/5 - 1/7 + 1/9...\n\nThis will give you an approximation of one fourth of pi. With those first five terms, we get about 0.83492 for pi/4, which gives the value of pi as about 3.33968. The real first 6 digits of pi are 3.14159, so you can see that this method needs a lot of terms to be accurate. But it is both conceptually easy and simple to remember.\n\nIf you want to learn more, try http://www.escape.com/~paulg53/math/pi/index.html , which has some other methods for how to calculate pi. The wikipedia article on pi (http://en.wikipedia.org/wiki/Pi ) also has other formulae, including some very modern ones.
943673
Pi is a constant, just like 2 or 3.
648028
Pi is the ratio of the circumference of a circle to its radius.  Of course, this ratio exists whether we're aware of it or not, whether we think it's important or not.  Many ancient cultures had some sort of approximation to pi.  I don't know if the culture that built Stonehenge was one.  But I do know that there is a tendency to "see" a lot of things in an important monument like Stonehenge that may or may not have been intended by its makers.
461233
In Euclidean plane geometry, π may be defined either as the ratio of a circle's circumference to its diameter, or as the ratio of a circle's area to the area of a square whose side is the radius. Advanced textbooks define π analytically using trigonometric functions, for example as the smallest positive x for which sin(x) = 0, or as twice the smallest positive x for which cos(x) = 0.\n\nAll these definitions are equivalent, they amount to the following numerical value of π, truncated to 50 decimal places:\n\n3.14159265358979323846264338327950288419716939937510
569561
Pi is the ratio of circumference to diameter. The Indians, the Egyptians, the Greeks and the Babylonians all knew that the ratio of the circumference to the diameter of a circle is the same for all circles, and that it is slightly more than 3. The Indians and Greeks also knew that the area of a circle is πr^2. Archimedes showed that the volume of a sphere is (4/3)πr^3 and that the surface area of a sphere is 4πr^2. By finding perimeters of circumscribed and inscribed regular polygons, Archimedes found that π is between 3 + 10/71 and 3 + 1/7.  In 1761, Johann Heinrich Lambert showed that π is an irrational number by showing that it has a generalized continued fraction that does not terminate. In 1882, Ferdinand von Lindemann proved that π is a transcendental number. With the appearance of computers, a hunt on millions and billions of decimal places of π has started and is still ongoing.
338526
diameter x pi\npi=3.14159...\n\nthat's it
932970
try this\nhttp://en.wikipedia.org/wiki/Pi
479789
pi is a division of math and since math never changes it is the same value as here in the U.S. and yes i agree with "losers" plz dont make fun of my country
42714
3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 \n\n= "pi."  This number is calulated by dividing a circle's circumference by its diameter.  This number, or ratio, holds steady for all sizes of circles.
325893
PI= π = 22/7 = 3.1428571428571428571428571428571\n\nIn Euclidean plane geometry, π may be defined either as the ratio of a circle's circumference to its diameter, or as the ratio of a circle's area to the area of a square whose side is the radius. Advanced textbooks define π analytically using trigonometric functions, for example as the smallest positive x for which sin(x) = 0, or as twice the smallest positive x for which cos(x) = 0.\n\nAll these definitions are equivalent, they amount to the following numerical value of π, truncated to 50 decimal places:\n\n3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510
295056
history of PI~~\nthe symbol "π" for Archimedes' constant was first introduced in 1706 by William Jones when he published A New Introduction to Mathematics, although the same symbol had been used earlier to indicate the circumference of a circle. The notation became standard after it was adopted by Leonhard Euler. In either case, 'π' is the first letter of περιμετρος (perimetros), meaning 'measure around' in Greek