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.
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