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2 x 90 = 180 and its square root to 4 decimal places is 13.4164
sqrt 90 = sqrt 9 x sqrt 10 = 3 root 10. Root 10 is irrational so sqrt 90 is irrational.
9.48683298 is the square root of 90
Yes. In general, if an integer is not a perfect square, its square root is irrational.
Approximately 9.49