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2 February, 12:36

In right triangle ABC A and B are complementary angles and sin A = 8/9. What is cos B?

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Answers (2)
  1. 2 February, 12:40
    0
    CosB = cos (π/2-A)

    = sinA

    =8/9
  2. 2 February, 12:59
    0
    If the sin A = 8/9 then

    Angle A = arc sine (8/9) =

    62.734 Degrees

    Angle B is the complement of Angle A and equals

    90 - 62.734 Degrees =

    27.266 Degrees

    cosine (27.266) = 0.88889
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