sqrt(25/81) = +/- 5/9
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sqrt(25/81) = 5/9
The square root of 6561 is 81.
The quad root of 81 is 3 but the square root of 81 is 9
81 is the square root of 405. (81 x 5 = 405.)
No. The square root of 81 is 9, which is a rational number.