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Moment about a point

  1. Aug 1, 2016 #1
    1. The problem sttatement, all variables and given/known data
    i dont understand the moment FDC(sin18.43)(9) , I think it's wrong..
    http://imgur.com/a/qPdqf

    2. Relevant equations


    3. The attempt at a solution
    I think it should be FDC(cos18.43)(3), am i right?
    the r is the perpedicular distance from D to force FDC, i have circled it....
    Or I'm wrong? FDCsin18.43)(9) represent other moment?
     
  2. jcsd
  3. Aug 1, 2016 #2
    sorry, photo here
     

    Attached Files:

  4. Aug 1, 2016 #3
    there' also moment caused by other forces such as 2KN at B , why didnt the author consider that? the 2kN force can cause moment about I ,right?
     
  5. Aug 2, 2016 #4
    is the author wrong ?
     
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