Apply the square root to 25/36, which is the same as square rooting each piece of the fraction
sqrt(25) = 5
sqrt(36) = 6
Put another way, you can think of it in reverse:
(5/6)^2 = (5/6)*(5/6) = (5*5)/(6*6) = (5^2)/(6^2) = 25/36
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