Answer:
D
Step-by-step explanation:
using the cosine ratio in the right triangle
cos ABC = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{BC}{AB}[/tex] = [tex]\frac{3}{9}[/tex] = [tex]\frac{1}{3}[/tex] , then
∠ ABC = [tex]cos^{-1}[/tex] ( [tex]\frac{1}{3}[/tex] ) ≈ 70.53° ( to 2 dec. places )
