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Answer:
71.1 degrees
Step-by-step explanation:
The side opposite angle A is 35 and that adjacent to angle A is 12. The trig function that connects A and these two sides is
tan A = (opp) / (adj)
which here is
tan A = 35/12. Find A using a calculator's arctan function:
arctan 35/12 = 1.25 radian or 71.1 degrees.