Step-by-step explanation:
Angle B = ?
opposite = side opposite the angle B = AC
adjacent = BC = 5
hypotenuse = AB = 9
To get ∠B, we would aplly the cosine ratio since we know the hypotenuse and the adjacent
cos∠B = adjacent/hypotenuse
cos∠B = 5/9
cos∠B = 0.5556
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∠B = cos