#Flux problem, how do i deal with a surface and not a solid?

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I need help understanding c)
btw the pictures are showing from backwards, so go from the bottom right picture to the left to see the pictures in the right order
for example why is N=-k for A, and -i for B and so on? where does that come from
normally when i deal with flux problems i get some type of volume like in b) but in c), i only get that triangle which is just a surface? Idk how to do it here
someone whos good at calculus 3 help me out