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Math Help - Trigonometry

  1. #1
    Member helloying's Avatar
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    Trigonometry

    B is a right angle.DF is the dotted vertical line from D
    Attached Thumbnails Attached Thumbnails Trigonometry-img011.jpg  
    Last edited by helloying; December 6th 2008 at 08:39 PM.
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  2. #2
    Member Mentia's Avatar
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    Do you have any other angles besides C? It seems to me that the distance from D to A could be anything if angle B is not fixed.
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  3. #3
    Member helloying's Avatar
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    i forgot to indicate. B is a right angle.
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  4. #4
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    "C is 320"

    in the drawing C seems less than 180
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  5. #5
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    what are you trying to find? your sketch says "DF"
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  6. #6
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    Quote Originally Posted by helloying View Post
    i forgot to indicate. B is a right angle.
    You don't forget.
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  7. #7
    Member helloying's Avatar
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    C is not 320 degree. sorry if my scan is not clear. What i wrote is The bearing of D from C is 320 degree.The sentence continue to C...

    And I am suppose to find the dist DF

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  8. #8
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    Quote Originally Posted by helloying View Post
    C is not 320 degree. sorry if my scan is not clear. What i wrote is The bearing of D from C is 320 degree.The sentence continue to C...

    And I am suppose to find the dist DF

    ok ... maybe my eyesight is worse than i thought

    where is F?
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  9. #9
    Member helloying's Avatar
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    Omg! I didn't indicate. I am so blur. It is the dotted vertical line.
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  10. #10
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    if point F is at the bottom of the dashed line segment, then ...

    DF = 150 + 200\cos(40^{\circ})
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  11. #11
    Member Mentia's Avatar
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    With B a right angle its do-able. Consider the little triangle made if you draw a horizontal line across the rhombus on the right from the intersection at angle C to the dotted line. You have have a right triangle and since you know C you know all if its angles, and you know its hypotenuse is 200, so you can solve for all its sides. Then you know the base length of the rhombus and the height. Then you know the base length of the big triangle on the left and its height, and use pythagorean theorem to solve for the hypotenuse.
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