Changes

*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.  

*So <math>\pi</math>=\frac{C}{d}</math>, the ratio <math>\frca{C}{d}</math> is constant, and it is not considering the circle's size.

*So <math>\pi</math>=\frac{C}{d}</math>, the ratio <math>\frac{C}{d}</math> is constant, and it is not considering the circle's size.

*<math>\pi</math> is a transcendental number and irrational number.  

*<math>\pi</math> is a transcendental number and irrational number.  

*Being an irrational number,π cannot be expressed exactly as a ratio of any two integers ,but we can express as the fraction 22/7 is approximate to the  <math>\pi</math> value.

*Being an irrational number,π cannot be expressed exactly as a ratio of any two integers ,but we can express as the fraction 22/7 is approximate to the  <math>\pi</math> value.