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Wrapped rope around a dowel

  1. Aug 14, 2013 #1
    Why in the provided explanation the mentioned triangles are similar?
    Thanks in advance
     

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  3. Aug 14, 2013 #2

    mfb

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    Staff: Mentor

    The angle is chosen in such a way that they are. (they are isosceles triangles, they are similar if the angle at the center of the circle is the same).
     
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