9 and 10
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The square root of 72 is between 8 and 9 BECAUSE 8 squared is 64 9 squared is 81 since 72 lies between 64 and 81, then the square root must lie between 8 and 9
36
6 root(2) = root(36) root(2) = root(36 x 2) = root(72).
36
8.485281374