Use Pythagoras theorem to find the length of SQ:-
SQ^2 = 3^2 + 4^2 (because SP = 3 and PQ = 4 cms)
SQ = sqrt (9 + 16) = 5
So tan < USQ = 6/5
the required value of the angle = 50.194 degrees = 50 12'
Its option C
