Answer:
Option A - [tex]\pi[/tex]
Step-by-step explanation:
To find : Which of the following is an irrational number?
Solution :
Irrational number is defined as number which cannot be written in the form is p/q where p and q are integers and q is non-zero.
Irrational number is non-repeating and non-terminating.
A) [tex]\pi[/tex]
The value of pi is [tex]\pi=3.14159265..[/tex]
The number is non-terminating and non-repeating.
So, [tex]\pi[/tex] is an irrational number.
B) [tex]-\frac{16}{3}[/tex]
The number is written in p/q form so it is rational number.
C) [tex]2.6=\frac{26}{10}[/tex]
The number is written in p/q form so it is rational number.
D) 18
The number is a rational number.
Therefore, Option A is correct.
