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21) Find the measure of angle B.

21 Find The Measure Of Angle B class=

Sagot :

Answer:

∠ B ≈ 56.3°

Step-by-step explanation:

Using the cosine ratio in the right triangle

cos B = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{BC}{AB}[/tex] = [tex]\frac{5}{9}[/tex] , then

B = [tex]cos^{-1}[/tex] ([tex]\frac{5}{9}[/tex] ) ≈ 56.3° ( to the nearest tenth of a degree )

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