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25 August, 12:29

In right ∆ABC, C is a right angle and sin A = 243/312, what is m

A) 52.19 degrees

B) 51.16 degrees

C) 44.32 degrees

D) 38.84 degrees

E) 37.91 degrees

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Answers (1)
  1. 25 August, 13:18
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    Sin A = cos B, where:

    cos B = 243/312

    Taking the arc cosine to look for the measure of the angle, this is shown below:

    B = arccos (243/312)

    B = 38.84 degrees

    Among the choices, the correct answer is D. 38.84 degrees.
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