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Math Help - trigonometry

  1. #1
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    trigonometry

    could someone tell me if this problem is correct?


    http://i333.photobucket.com/albums/m...g?t=1229051527



    Thank you!
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  2. #2
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    140 ? from where is there this information?
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  3. #3
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    since side a = 5.9 and side b = 5.9, the angle of A and B are the same. So I subtracted (20 + 20) degrees from 180 degrees which gave me 140 degrees.
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  4. #4
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    I see. Following step is unbelievable.
    It"s sure that sin(20)/5.9 < 1 because sin(x)<1 always.

    This solution seems me a little confused.
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