The irrational number is 18.
We have to determine
Which number is irrational?
What is an irrational number?
Rational numbers are numbers that can be written in the form of a fraction where numerator and denominator are integers.
In the case of rational numbers, numerator and denominator should be coprime and denominator should not be equal to zero.
The square root of any nonperfect square is irrational.
Here 4, 25, and 36 are the perfect square root.
[tex]\rm \sqrt{16} = 4\\\\\sqrt{18} = 4.6\\\\\sqrt{25} = 5\\\\\sqrt {36}=6[/tex]
Hence, the irrational number is 18.
To know more about Irrational numbers click the link given below.
https://brainly.com/question/21135698
