File:Neusis-trisection.png

  Neusis trisection of an angle θ>135° to find φ=θ/3, using only the length of the ruler. The radius of the arc is equal to the length of the ruler. Used

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shifted z2; for i = 1,2,6,7,3,4: if known(x[i]): drawdot z[i] withpen pencircle scaled thick; fi endfor endfig; bye Image:Neusis-trisection.png English

DescriptionAngle trisection archimedes.png English: angle trisection due to archimedes Date 12 October 2015 Source This file was derived from: Трисекция

DescriptionWinkeldreiteilungArchimedes.PNG Deutsch: Geometrische Skizze zur Winkeldreiteilung Date 13 February 2008 Source Own work (Original text: selbst