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Statics and use of similar triangles

  1. Nov 10, 2009 #1
    1. The problem statement, all variables and given/known data
    How come all thetas are equivalent?

    Please take a look at this drawing http://tinypic.com/view.php?pic=2aahe3d&s=4

    3. The attempt at a solution

    By similar triangles?
  2. jcsd
  3. Nov 10, 2009 #2


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    Re: Trigonometry/Geometry

    Can you show that the triangles are similar? I can't.

    Are the two vertical lines supposed to be parallel? That would help with the two θ's at the bottom of the figure.

    p.s. Welcome to Physics Forums :smile:
  4. Nov 10, 2009 #3


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    Re: Trigonometry/Geometry

    If the lines that look perpendicular are and the lines that look horizontal or vertical are, think about the geometry theorem that says two angles with corresponding sides perpendicular are equal. (Assuming you pick the correct angle, not its supplement. :wink:).
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