PI PERKINS WOODWORKING INC
the free encyclopedia Number · approximately 3.14 This article is about the mathematical constant. For the Greek letter · see Pi (letter) . For other uses · spelled out as pi ) is a mathematical constant · approximately equal to 3.14159 · and some of these formulae are commonly used for defining π · to avoid relying on the definition of the length of a curve . The number π is an irrational number · meaning that it cannot be expressed exactly as a ratio of two integers · although fractions such as ⁠ · 22 / 7 ⁠ · are commonly used to approximate it . Consequently · its decimal representation never ends · nor does it enter a permanently repeating pattern . It is a transcendental number · meaning that it cannot be a solution of an algebraic equation involving only finite sums · products · powers · sometimes by computing its value to a high degree of accuracy. Ancient civilizations · including the Egyptians and Babylonians · required fairly accurate approximations of π for practical computations. Around 250   · Chinese mathematicians approximated π to seven digits
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