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<p><b>New page</b></p><div>'''PI''' (or '''Pi''') is a mathematical constant that represents the ratio of a circle's circumference to its diameter. It is approximately equal to 3.14159, but it is an irrational number, meaning it cannot be expressed as a simple fraction and its decimal representation never ends or repeats.<br />
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== History ==<br />
The concept of PI has been known for nearly 4000 years. The ancient Egyptians and Babylonians had a rough understanding of the concept, and the Greek mathematician Archimedes is often credited with having made a more accurate calculation of PI.<br />
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== Mathematical Properties ==<br />
PI is a transcendental number, which means it is not the root of any non-zero polynomial equation with rational coefficients. It is also an irrational number, which means it cannot be expressed as a simple fraction and its decimal representation never ends or repeats.<br />
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== Uses ==<br />
PI is used in many areas of mathematics and science, including geometry, trigonometry, physics, and engineering. It is also used in statistics, where it appears in the formula for the normal distribution.<br />
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== See Also ==<br />
* [[Mathematics]]<br />
* [[Geometry]]<br />
* [[Trigonometry]]<br />
* [[Physics]]<br />
* [[Engineering]]<br />
* [[Statistics]]<br />
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== References ==<br />
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[[Category:Mathematics]]<br />
[[Category:Geometry]]<br />
[[Category:Trigonometry]]<br />
[[Category:Physics]]<br />
[[Category:Engineering]]<br />
[[Category:Statistics]]<br />
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