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Talk:Regular polygon (view source)
Revision as of 18:24, February 22, 2008
, 18:24, February 22, 2008Query about enneagons
== Mistake? ==
"Gauss ... showed that a regular n-sided polygon can be constructed with ruler and compass if the odd prime factors of n are distinct Fermat primes." I'm not sure that this is right. According to [http://mathworld.wolfram.com/ConstructiblePolygon.html], an enneagon cannot be constructed with ruler and compass. [[User:Sepura|Sepura]] 13:24, 22 February 2008 (EST)
"Gauss ... showed that a regular n-sided polygon can be constructed with ruler and compass if the odd prime factors of n are distinct Fermat primes." I'm not sure that this is right. According to [http://mathworld.wolfram.com/ConstructiblePolygon.html], an enneagon cannot be constructed with ruler and compass. [[User:Sepura|Sepura]] 13:24, 22 February 2008 (EST)