Why
Why do you need to know the dihedral.
This is set up with wash out during wing build or rebuild on a jig.
If I remember correctly (its be over 25years that I last rebuild a 172 wing ) the dihedral and wash out starts outboard of the wing strut. The info should be either in the SRM or Flight manual . Not sure now its be to long. The only adjust you have is at the rear wing to fuse attachment bush .
With regards to your fuel tanks, why do you want the size, If the P/no is not correct, its the wrong tank !
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