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Need help with a triangle's length side/ angle relation.

  1. May 31, 2015 #1
    I am trying to wrap my head around where from did he got the x = sin of theta equation at the 32:44 mark of the video: .
    Isn't sine of theta x over the hypotenuse in the diagram ?
    Thanks in advance!
  2. jcsd
  3. May 31, 2015 #2


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    Staff: Mentor

    Yes it is, and the length of the hypotenuse (=the pendulum arm) seems to be 1.
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