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Math Help - Fundamental Trigonometry - help

  1. #1
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    Fundamental Trigonometry - help

    I'm trying to solve this problem: Fundamental Trigonometry - help-unavngivet.png

    I want to find teh angle D and the area of the parallelogram.

    I'm not sure, but using the cosinusrelations i get that angle D is 103,14?

    but what about the area?

    I'm also having trouble finding the angle BCA and the length EC.

    Can somone please help?

    Thx
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  2. #2
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    Quote Originally Posted by Darkplayer View Post
    I'm trying to solve this problem: Click image for larger version. 

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    I want to find teh angle D and the area of the parallelogram.

    I'm not sure, but using the cosinusrelations i get that angle D is 103,14?

    but what about the area?

    I'm also having trouble finding the angle BCA and the length EC.

    Can somone please help?

    Thx
    If you know the cosine relation and you know that it is a parallelogram that BCA should be a piece of cake? You have 3 sides just do the relations again to find that angle.
    To find the area you know the sin formula for that?
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  3. #3
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    Quote Originally Posted by Henryt999 View Post
    If you know the cosine relation and you know that it is a parallelogram that BCA should be a piece of cake? You have 3 sides just do the relations again to find that angle.
    To find the area you know the sin formula for that?
    Is my answer right so far?
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