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2 September, 19:40

Cos 155 degrees equals

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Answers (2)
  1. 2 September, 19:50
    0
    type cos (155) into a calculator

    cos (155) = - 0.906307787 ...
  2. 2 September, 19:59
    0
    -0.9063077

    Step-by-step explanation:

    The cos of 155 degrees is equals to - 0.9063077

    To obtain cos 155 degrees in radian multiply 155 by π/180

    cos 155 degrees = (155 / 180) π radian

    Dividing 155 and 180 by its common factor 5 we will get (31/36) π

    so cos 155 in terms of radian is equals (31/36) π

    Since our angle is greater than 90 degrees and less than or equals to 180 degrees, it is located in quadrant II. In second quadrant the value of sin are positive only that is why cos 155 is - 0.9063077

    It can also be solved by using identities of cosine

    cos (∅) = sin (∅-90)

    putting ∅ = 155, we get

    = sin (155-90)

    = sin (-65)

    = - 0.9063077
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