irrational number

A number which can not be expressed as the ratio of two integers is called irrational number.

Example

√2

 

A non terminating and non repeating decimal is also called a rational number.

Example

0.10100100100001…………………………..

 π

About  π

The exact value of π is not 22 / 7.

22 / 7 is the approximate value of  π.

Similarly 3.14 is not an exact value of  π.