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Obstacles in chaining

  1. Sep 8, 2009 #1
    a river is flowing east west and a survey line ABC crosses the river perpendicular to the direction of flow.B is situated on the near bank and C on the far bank.A line BD 60 m long,was laid at B,perpendicular to AB,and the bearing of DC and DA were measured and found to be 33 degrees 30 minutes and 131 degrees 20 minutes respectively.if AB is 42 m .calculate the length of BC.

    only post me the sketch and correct answer for that problem.
     
  2. jcsd
  3. Sep 8, 2009 #2
    please reply me quick
     
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