Answer:
45°
Step-by-step explanation:
Using the cosine ratio in the right triangle
cosB = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{3}{3\sqrt{2} }[/tex] = [tex]\frac{1}{\sqrt{2} }[/tex], hence
B = [tex]cos^{-1}[/tex]( [tex]\frac{1}{\sqrt{2} }[/tex] ) = 45°
