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No, 90 is not a square number. 81 is 9 squared and 100 is 10 squared.
If x squared -10 = 0 then x = the square root of 10
The area of square is : 100.0
The square of any square root is equal to the number itself. For example, the square of the square root of 2 squared is equal to 2. The square root of 10 squared is equal to 10.Similarly, the square of the square root of 2 is equal to 2.
10 squared is 100. 20 squared is 400. 225 is between 100 and 400. Its square root will be between 10 and 20.