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Homework Help: Easy yes or no answer sine law question.

  1. Apr 18, 2010 #1
    1. The problem statement, all variables and given/known data\
    Is it ok to use sine law for this :

    A=sIN^-1(40SIN120/65.8)

    im not sure if this applies to the sin law angle restriction where the angle cant be over ??degrees?
     
  2. jcsd
  3. Apr 18, 2010 #2

    Mark44

    Staff: Mentor

    sin(120 deg.) = sin(60 deg.). The sin-1 (or arcsin) function on a calculator will give you a value between -90 degrees and +90 degrees, so for some triangles with angles larger than 90 deg., you need to take this into account.
     
    Last edited by a moderator: Apr 19, 2010
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