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8/sqrt(2) = (2*4)/sqrt(2) = sqrt(2)*sqrt(2)*4/sqrt(2) = 4*sqrt(2)
in case you didn't understand the above writing - 4 times the square root of 2
It is the square root of 8
2
square root 2 times square root 3 times square root 8
0.75
its about 5.657. 8 divided by the square root of 2