Manhattan Prob solving Question doubt

GRE Quant Problem Solving
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doubt
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What would be the correct answers for this?

Answer in that is A,B,C,G
But why not F?
Because if we get that sum, we can then subtract that sum from 180 degrees (sum of angles of a triangle), and we get angle v, then applying exterior angle theorm, and we get angle r.
Do correct me if I am wrong.

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Using the exterior angle theorem, you can indeed show that r = u + v. But you know v, but you don’t actually know u (all you know is what s + u is)

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Ohhhhh, I get it. Was a bit tricky tho!! Thanks!!!