Trisecting an angle

  • #1

Main Question or Discussion Point

i have read that it has been proven that an angle cannot be trisected using just a compass and a straight-edge (unless it is some specific angle, e.g., 90 degrees or 180 degrees). can anyone tell me where i can find the proof? can anyone suggest any website?
 

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  • #2
arildno
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Buy an introductory book in algebra&group theory.
 
  • #4
ssd
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i have read that it has been proven that an angle cannot be trisected using just a compass and a straight-edge (unless it is some specific angle, e.g., 90 degrees or 180 degrees). can anyone tell me where i can find the proof? can anyone suggest any website?
If you are allowed to mark the straight edge with a pencil, then you can certainly trisect any acute angle. Of course, with marking not permitted you cannot.
 

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