You can either express it as a number in a radical - possibly in the hope or expectation that it will cancel out. Or you approximate it using one of several methods. Since it is irrational, you can never write down its value in the form of a ratio, terminating or recurring decimal.
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irrational
No, because it has a finite value. Irrational numbers have no finite value. Eg, Pi and the square root of 2.
The square root of 20 is an irrational number that can be expressed as 2 times square root of 5
It is a irrational number. Because the square root of every imperfect square is irrational number.
Yes, square root of 33 is irrational.