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Line 13: − − <big><math>\pi</math></big> is referenced in the [[Bible]], literature, and even as the title of a movie.
Pi is referenced in the Bible, literature, and even as the title of a movie. It is central to the most famous equation in all of mathematics: Euler's Formula.
| title = A history or Pi
| title = A history or Pi
| accessdate = 2012-02-11}}</ref>, who selected '''<big><math>\pi</math></big>''' because it is the first letter of the Greek word for [[perimeter]] (''περίμετρος''), i.e. the circumference of a circle is its perimeter. A Swiss mathematician, [[Leonhard Euler]], brought the concept into general use in 1737.
| accessdate = 2012-02-11}}</ref>, who selected '''<big><math>\pi</math></big>''' because it is the first letter of the Greek word for [[perimeter]] (''περίμετρος''), i.e. the circumference of a circle is its perimeter. A Swiss mathematician, [[Leonhard Euler]], brought the concept into general use in 1737.
<big><math>\pi</math></big> is referenced in the [[Bible]], literature, and even as the title of a movie. It is central to the most famous equation a in all of mathematics: [[Euler's Formula]].
The value of '''<big><math>\pi</math></big>''' is approximately 3.1416, or 22/7. The exact value cannot be expressed as a [[fraction]] or as a [[decimal]] number, regardless of how many [[digit]]s are used. Johann Heinrich Lambert proved this in 1761 by showing that '''<big><math>\pi</math></big>''' is an [[irrational number]], which means that it can't be expressed as a fraction.<ref>{{cite web
The value of '''<big><math>\pi</math></big>''' is approximately 3.1416, or 22/7. The exact value cannot be expressed as a [[fraction]] or as a [[decimal]] number, regardless of how many [[digit]]s are used. Johann Heinrich Lambert proved this in 1761 by showing that '''<big><math>\pi</math></big>''' is an [[irrational number]], which means that it can't be expressed as a fraction.<ref>{{cite web
| title = Biography of Carl Louis Ferdinand von Lindemann
| title = Biography of Carl Louis Ferdinand von Lindemann
| accessdate = 2012-02-12}}</ref>
| accessdate = 2012-02-12}}</ref>
==History==
==History==