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==Description==
==Description==
*This function gives the value of pi.
*This function gives the value of <math>pi</math>.
*The pi is a mathematical constant with a value approximate to 3.14159.
*The <math>pi</math> is a mathematical constant with a value approximate to 3.14159.
*It is denoted by the Greek letter <math>\Pi</math>.
*It is denoted by the Greek letter <math>\Pi</math>.
*<math>\Pi</math> is commonly defined as the ratio of a circle's circumference C to its diameter d.
*<math>\Pi</math> is commonly defined as the ratio of a circle's circumference C to its diameter d.
*<math>\Pi</math> is a transcendental number and irrational number.
*<math>\Pi</math> is a transcendental number and irrational number.
*Being an irrational number,<math>\Pi</math> cannot be expressed exactly as a ratio of any two integers .
*Being an irrational number,<math>\Pi</math> cannot be expressed exactly as a ratio of any two integers .
* But we can express as the fraction <math>\frac {22}{7} is approximate to the π value , also no fraction can be its exact value.
* But we can express as the fraction <math>\frac {22}{7}</math> is approximate to the <math>\Pi</math> value , also no fraction can be its exact value.