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Geometry proof

  1. Sep 9, 2006 #1
    Hello, I need help. I need to find a place to start

    For the following seven pointed star, detrmine the sum of angles at the tips of the star.

    Is there any rule on how to determine the sum of the angles in an irregular star like this one.

    Help.
     

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  2. jcsd
  3. Sep 9, 2006 #2

    StatusX

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    Homework Helper

    Try adding up every angle in sight (ie, those making up the 7 triangles and the septagon) and then subtracting the angles you don't want.
     
  4. Sep 10, 2006 #3

    HallsofIvy

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    The total angles in the figure that StatusX is talking about: imagine walking along the figure making the turn at each angle: you wind up facing exactly the way you originally were. How many times do you make a complete rotation?
     
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