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Math Help - Help solving triangle please

  1. #1
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    Help solving triangle please

    Hey guys and girls I have a maths problem I'm stuck on I keep seeming to get the wrong answer when I move on to work out the angle of the triangle. Attached is the question and my working sheet in an image format. If anyone could tell me where I've gone wrong and help that would be great!

    Thanks in advance.Help solving triangle please-img026.jpg
    Help solving triangle please-img027.jpgClick image for larger version. 

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ID:	28413Like I said it is when using the cosine rule to work out the angle that I struggle and seem to get the wrong answer.
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  2. #2
    Senior Member Paze's Avatar
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    Re: Help solving triangle please

    Can you upload the picture to imgur or some place? I can barely read the text.
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  3. #3
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    Re: Help solving triangle please

    Here's the link to view the images: matt4935's uploaded images - Imgur
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  4. #4
    Senior Member Paze's Avatar
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    Re: Help solving triangle please

    Quote Originally Posted by matt4395 View Post
    Here's the link to view the images: matt4935's uploaded images - Imgur
    "matt4935's images are not publicly available."
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  5. #5
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    Re: Help solving triangle please

    Hey sorry about that new to using this website.

    imgur: the simple image sharer
    imgur: the simple image sharer

    Hope this works!
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  6. #6
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    Re: Help solving triangle please

    You have a triangle, ABD, in which the side AB has length 6m, side BD has length 5m and the angle ABD is 20 degrees. The "cosine law" say that AB has length s where s^2= 6^2+ 5^2- 2(6)(5)cos(20)= 36+ 25- 10(0.93969)= 61- 9.4= 51.6
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  7. #7
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    Re: Help solving triangle please

    Help solving triangle please-21-may-13-2.png
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  8. #8
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    Re: Help solving triangle please

    ah thank you very much I think I see where I have gone wrong now
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  9. #9
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    Re: Help solving triangle please

    Poo I meant it was when using the sine rule! Darn! SORRY Guys but yeah I actually did get the Cosine wrong
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