Answer:
∠ B ≈ 72°
Explanation:
Using the tangent ratio in the right triangle
tan B = = = = 3 , thus
B = (3) ≈ 72° ( to the nearest degree )
C= 72
Because if AB=3 and AC= 9 and you solve and find all the side lengths you will get 71.565 for m<B and you round to the nearest degree its 72. Hopefully this helps you and you get it right. But I'm 100% it is 72.
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= 
= 
= 3 , thus
(3) ≈ 72° ( to the nearest degree )