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Math Help - Trig question help (Determining length)

  1. #1
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    Trig question help (Determining length)

    can someone please help me out.... I have a question and yes it's for homework but I have no idea on how to even begin it.... To me it looks like they already gave the answer or something but I'm not sure how to start or how to do it... Can someone please help me out.


    Determine the length of each unknown variable:




    How do I solve this? I have no idea on where to even begin... If someone can help me it will be greatly appreciated... I can't show the work I've alreayd done because I don't know how to do this..


    Thanks for all the help though if you can answer this


    Alright I tried to re-edit it... does it work now?
    Attached Thumbnails Attached Thumbnails Trig question help (Determining length)-assign_question1a.gif   Trig question help (Determining length)-assign_question1b.gif  
    Last edited by agent2421; November 13th 2009 at 10:23 AM.
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  2. #2
    Super Member bigwave's Avatar
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    in a circle of radis r of angle of radian measure \theta

    subtends an arc of lenght s = r\theta

    this basically what you need to know to solve this
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  3. #3
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    I still don't understand how to solve this... can you go a litlte more in depth than that?


    Are the answers:


    A) = 3.142

    B) = 5.783 rad


    because maybe this is why I'm confused... I was given this question to solve but below the 2 pictures it had those which I think are already the answers....
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  4. #4
    Super Member bigwave's Avatar
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    ok the first is
     <br />
a = \frac{\pi}{3}*3 = \pi  \ or  \ 3.142 \ cm<br />

    the second one is
    just subtracting  \theta from 2\pi
     <br />
\theta =  \frac{2}{4} = \frac{1}{2}<br />

     <br />
2\pi - \frac{1}{2} = 5.783\ rad<br />
    Last edited by bigwave; November 13th 2009 at 12:46 PM.
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  5. #5
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    thank you so much! I understand it now.
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