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Math Help - Please help. Trig. problem that I'm stuck on

  1. #1
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    Please help. Trig. problem that I'm stuck on

    Hi
    I'm new to the forum so I hope I'm posting in the correct place.

    Anyway, there's a question that I'm really stuck on, I know it's probably simple but I can't seem to see where I'm going wrong. If anyone could help with how to work it out, I would be so grateful. Here it is:

    In the following diagram, AB=8.5m is the perpendicular height of a pole, and CD=6.9m is the perpendicular height of a second pole. The angle CDB is 100. Calculate:
    a) the distance AC between the base of the poles. (2d.p.)
    b) the length of BD, the distance between the tops of the poles. (2d.p.)


    Thanks in advance.
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  2. #2
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    Re: Please help. Trig. problem that I'm stuck on

    sketch an auxiliary line ED parallel to AC ... m\angle{BDE} = 10^\circ

    \Delta BDE is a right triangle ... you have a side length (BE) and an angle.

    finish it.
    Attached Thumbnails Attached Thumbnails Please help. Trig. problem that I'm stuck on-trapproblem2.png  
    Thanks from Leanne753
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  3. #3
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    Re: Please help. Trig. problem that I'm stuck on

    Ah!! Thank you so much!!
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