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Find the Angle

  1. Aug 10, 2013 #1
    1. The problem statement, all variables and given/known data

    Solve for [itex]\theta[/itex]


    2. Relevant equations


    3. The attempt at a solution


    I know, but I have forgotten my basic geometry.
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Aug 10, 2013 #2


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    You have a good start with the 60 degree angle that you identified. Try working with the red right triangle in the attachment.

    Attached Files:

  4. Aug 10, 2013 #3
    I wasn't sure if that was a right angle.

    If so, then the entire problem was a piece of cake. If not, then it's more complicated than I thought.
    Last edited: Aug 10, 2013
  5. Aug 10, 2013 #4


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    I did make the assumption that the blue line shown is constructed to be a "normal line" (i.e., perpendicular to the slope). That's the usual case when working inclined plane problems.

    However, if it is not given to be a normal line, then you can't find θ without additional information.

    Attached Files:

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