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Please find these angle.

  1. Mar 22, 2013 #1
    1. The problem statement, all variables and given/known data

    If we know θ3, A, B, C, How can we find these 2 angle (θ1 and θ2). Please help me find the equation.

    2. Relevant equations

    Credit : http://www.mathsisfun.com/algebra/trig-sine-law.html
    The Law of Sines (or Sine Rule) is very useful for solving triangles:

    It works for any triangle:

    a, b and c are sides.

    A, B and C are angles.

    (Side a faces angle A,
    side b faces angle B and
    side c faces angle C).

    a/sin A = b/sin B = c/sin C


    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Mar 22, 2013 #2

    Simon Bridge

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    Welcome to PF;
    You are on to a good start with the law of sines and the law of cosines.
    Did you try applying them?

    It may help to arm yourself with a list of trig identities too.
    Note: you may have to use the unlabelled lengths and angles as intermediate steps.
    Don't be frightened to experiment.
    For instance - if θ1=θ3, then What is the relationship between B and C?
    In this case they are not equal though - what is the relationship?
     
    Last edited: Mar 22, 2013
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