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I think I trisected an angle. SERIOUSLY.

  1. Oct 11, 2007 #1
    Angle Trisection

    Hello, I know the stuff about how trisecting angles using only a compass and straightedge is impossible. So then could you explain this? I have posted some pictures at http://www.flickr.com/photos/14902182@N04/ which i made using geometers sketchpad.

    Edit: Nevermind. I assumed that slope was the same as an angle.
    Last edited: Oct 12, 2007
  2. jcsd
  3. Oct 11, 2007 #2


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    The angle you made seems to be [itex]\tan^{-1}3-\frac\pi4\approx26.6^\circ[/itex] which isn't a trisection of the [itex]\tan^{-1}3\approx71.6^\circ[/itex] angle.

    More importantly, the trisection must be of a general angle, not of a particular one you decide. I can drop a perpendicular to a line and call it the result a trisected [itex]270^\circ[/itex] angle...
  4. Oct 11, 2007 #3
    Nevermind. I assumed that slope was the same as an angle.
  5. Oct 12, 2007 #4
    can someone point me to a resource on reading about this whole using circles to do geometric proofs thing. i have no idea how any of these relationships are derived.
  6. Oct 12, 2007 #5


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    Dad, are you SURE you cant get something for nothing?
  7. Oct 12, 2007 #6
    Is that directed at me?
    Last edited: Oct 12, 2007
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