. Which one of the following is an irrational number

A: π

B: √9

C: 1/4

D: 1/5

Best Answer

Explanation:

Irrational Number: Number which has non-terminating and non-recurring decimal expansion.

Here,

π=3.1415926535897932846264338332..............

√9=3

1/4=0.25

1/5=0.2

Which implies that π satisfies the definition of an irrational number.

Final Answer:

Hence, Option (A) is correct, i.e.π is an irrational number.

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