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Math Help - Sine rule help! + pics

  1. #1
    Newbie
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    Jun 2009
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    Sine rule help! + pics

    Hi everyone, new user on here!

    I have an assignment in tomorrow which i have been trying to do for months! I will give you the question and hopefully some of you might be able to help me, i will also include a picture i drew

    Question

    "In the diagram below (Fig 1)AB is the inclined jib of a crane and is 10m long. AC is 4m long. Using the sine rule, calculate the inclination of the jib to the vertical and the length of tie CB. "

    Diagram:

    Sorry its soo big. I hope someone can help me!
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  2. #2
    MHF Contributor
    Joined
    Mar 2007
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    Talking

    If the angle at C (the one on top of the upper slanty line) is 120 degrees, then the angle below is 60 degrees.

    You have a side with length 10 and the measure of the angle opposite. You have a side with length 4 and you need the measure of the angle opposite.

    Plug this information into the Law of Sines, and solve for the needed angle measure.
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  3. #3
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    Thanks i think i have nearly got it!
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