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Hmm, I took another look at it. I'll make it 3d by making these sections into prisms of height h=1. They're all of length c=1, and width t, which equals t/c from the table. The quantity you want to minimize is CdA/V= (Cd*h*t)/(h*t*c)=Cd/c=Cd.
Therefore, section 5 is optimal.
Or at least, I think so. It is late and I am tired. Good night.
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