12.72792206 (to eight decimal places)
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It is 9 times square root of 2
√(16x16) = √(162), and since the square and square root cancel, the square root of 16x16 is 16.
They are 12 and 13
sqrt(162) = sqrt(81*2) = sqrt(81)*sqrt(2) = 9*sqrt(2).
162^(1/4) = 3.5676... or 162^(0.25) = 3.5676.....