The square root of the fraction 4/9 is either 2/3 or -2/3
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The square root of 81 is 9 and the square root of 4 is 2!
1.7778
Square root 2 is the square root of 4 3 is the square root of 9 and so on
sqrt(4/81) = sqrt(4)/sqrt(81) = 2/9
81