The angle that Julian is describing is; ∠G
We are told that Julian is describing an angle in the given right angle triangle GHK such that;
GH is the adjacent side.
HK is the opposite side.
GK is the hypotenuse.
Since GH is the adjacent side, so the angle may be ∠G or ∠H. However, HK is given to be opposite of the angle, and as such the required angle is ∠G.
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