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Why do we interpret this vertical angle to be a horizontal angle?

  1. Oct 25, 2014 #1
    At the point B, there is supposed to be a force B that is perpendicular to the angled piece of metal. Why is the angle that the force makes with the horizontal 20? Should it not be 70?

    2d1mn4p.png
     
  2. jcsd
  3. Oct 25, 2014 #2

    haruspex

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    The metal makes an angle 20 to the vertical, yes? So what angle does the force make to the vertical?
     
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