關於Maths兀(3.14pie)的問題

圓周率，一般以π來表示，是一個在數學及物理學普遍存在的數學常數。它定義為圓形之周長與直徑之比。它也等於圓形之面積與半徑平方之比。是精確計算圓周長、圓面積、球體積等幾何形狀的關鍵值。

在分析學上，π可以嚴格地定義為滿足 sin(x) = 0的最小正實數x，這裡的 sin 是正弦函數（採用分析學的定義）。

常用π的十進位近似值為3.1415926，另外還有由祖沖之給出的約率：
22/7 及密率 355/113 。

Pi or π is one of the most important mathematical constants, approximately equal to 3.14159. It represents the ratio of any circle's circumference to its diameter in Euclidean geometry, which is the same as the ratio of a circle's area to the square of its radius. Many formulas from mathematics, science, and engineering involve π.

It is an irrational number, which means that it cannot be expressed as a fraction m/n, where m and n are integers. Consequently its decimal representation never ends or repeats. Beyond being irrational, it is a transcendental number, which means that no finite sequence of algebraic operations on integers (powers, roots, sums, etc.) could ever produce it. Throughout the history of mathematics, much effort has been made to determine π more accurately and understand its nature; fascination with the number has even carried over into culture at large.

The Greek letter π, often spelled out pi in text, was adopted for the number from the Greek word for perimeter "περίμετρος", probably by William Jones in 1706, and popularized by Leonhard Euler some years later. The constant is occasionally also referred to as the circular constant, Archimedes' constant (not to be confused with an Archimedes number), or Ludolph's number.

π 這個圖形英文系pi .

2008-04-13 19:43:10 補充：
π = 兀

兀 = 14/7 or 3.14


兀是圓周率約3.1416即是圓的直徑與圓周的比率.
例如圓的直徑是1cm , 那圓周就是 兀cm 了 ...

計圓形既面積,周界
兀=3.142857142857142857142857142857142857142857142857142857.......

2008-04-13 18:40:06 補充：
兀=22/7,too

pie(兀)係數學裡面既一個符號~
用來計圓形既面積..周界呀等等~