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Prove that sina'=nsinb

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  1. May 19, 2016 #1
    1. The problem statement, all variables and given/known data
    look at the figure and prove that sina'=nsinb. We have given a, b, a', b' and n
    http://s32.postimg.org/n7rnu0khx/image.png

    2. Relevant equations
    sinb'/sina'=1/n

    3. The attempt at a solution
    But in the equation we have b, not b'. I made the figure. How would the correct one be?
     
  2. jcsd
  3. May 19, 2016 #2

    RUber

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    Can you prove that ##\sin b = \sin b'##?
     
  4. May 19, 2016 #3
    No, only if the triangle has 2 equal sides
     
  5. May 20, 2016 #4

    RUber

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    Are the dashed lines making a and a' forming right angles with the sides of the triangle?
    What other information do you have about this problem? How is the interior vector chosen/created?
     
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