0.2857
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sqrt(8)/28 = sqrt(4*2)/28 = sqrt(4)*sqrt(2)/28 = 2*sqrt(2)/28 = sqrt(2)/14 = 0.1011 approx.
28/sqrt(8) multiply top and bottom by sqrt(8) = 28*sqrt(8)/[sqrt(8)*sqrt(8)] = 28*sqrt(8)/8 = 7*sqrt(8)/2 But sqrt(8) = sqrt(4*2)= sqrt(4)*sqrt(2) = ±2*sqrt(2) then 7*sqrt(8)/2 = ±7*2*sqrt(2)/2 = ±7*sqrt(2)
3.5
0.0357
28
8