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How basic? I can just about 1+1=2 and that you can still just about get a round for under a tenner in certain pubs!
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Perhaps not that basic, indeed.

You're going to make me look like the nerd with big glasses that gets pushed by everybody at school.
Just use the sine function. If you you have a wing with 8° dihedral and want to apply a 1m diameter roundel to it, the roundel would appear to be 13.9 cm high in a profile. Sin(8)=0,139......
Comes in handy, believe me.
I have to leave you all now, because I'm late for my nuclear physics class.