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Pi  Definition, Symbol, Number, & Facts  Britannica
https://www.britannica.com/science/pimathematics
WEBpi, in mathematics, the ratio of the circumference of a circle to its diameter. The symbol π was devised by British mathematician William Jones in 1706 to represent the ratio and was later popularized by Swiss mathematician Leonhard Euler.
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Pi  Wikipedia
https://en.wikipedia.org/wiki/Pi
WEBThe number π (/ p aɪ /; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics.
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Pi  Math is Fun
https://www.mathsisfun.com/numbers/pi.html
WEBπ. Draw a circle with a diameter (all the way across the circle) of 1. Then the circumference (all the way around the circle) is 3.14159265... a number known as Pi. Pi (pronounced like "pie") is often written using the greek symbol π. The definition of π is: The Circumference. divided by the Diameter.
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Pi  Math.net
https://www.math.net/pi
WEBPi (π) is the ratio of the circumference of a circle to its diameter. The value of pi is 3.14159..., an irrational number. Pi is a constant value. That is, the ratio of the circumference to the diameter is the same for all circles.
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PI  Math.com
http://www.math.com/tables/constants/pi.htm
WEBPi 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.
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Pi  Brilliant Math & Science Wiki
https://brilliant.org/wiki/pi/
WEB\ (\pi\) is the ratio between a circle's circumference and diameter. That is, \ [\dfrac {\text {circumference}} {\text {diameter}}=\pi.\] \ (\pi\) is a fundamental constant in mathematics, especially in geometry, trigonometry, and calculus.
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What is Pi?  Pi Day
https://www.piday.org/learnaboutpi/
WEBPi (often represented by the lowercase Greek letter π), one of the most wellknown mathematical constants, is the ratio of a circle’s circumference to its diameter. For any circle, the distance around the edge is a little more than three times the distance across.
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Pi (π)  Math Tools
https://math.tools/numbers/pi/
WEBPi (π) The number π is a mathematical constant. It is defined as the ratio of a circle's circumference to its diameter, and it also has various equivalent definitions. It appears in many formulas in all areas of mathematics and physics. It is approximately equal to 3.14159. Pi (π) is also a really useful number.
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Value of Pi  Symbol, Examples, Pi Values  What is Pi?  Cuemath
https://www.cuemath.com/geometry/whatispi/
WEBPi is a mathematical constant with a value of 3.1415929. It is defined as the ratio of the circumference to the diameter of a circle. Learn about what is pi in math, its formula, and the 100 decimal places of pi.
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What Is Pi, and How Did It Originate?  Scientific American
https://www.scientificamerican.com/article/whatispiandhowdiditoriginate/
WEBMay 17, 1999 · Succinctly, pi—which is written as the Greek letter for p, or π—is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle's size, this ratio will...
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