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This user is able to contribute with a native level of Austrian German


Dear friends of Wikipedia,

something about me:

later through self-taught studies

On a continued good work for Wikipedia!

My contributions are included in ...

edit
  1. Square at a given side length and Square at a given diagonal (animations)
  2. Pentagon at a given side length and Euclid's method for pentagon at a given circle, using of the golden triangle, animation
  3. Hexagon at a given side length
  4. Heptagon, one animation shows a neusis construction by means of the tomahawk
  5. Heptagon, another animation shows a neusis construction by means of the marked ruler.
  6. Octagon at a given side length, animation
  7. Nonagon, Another two animations of an approximate construction
  8. Decagon at a given circumcircle and decagon at a given side length as animations, the golden ratio in decagon
  9. Hendecagon according to T. Drummond from 1800, approximation construction as an animation
  10. Dodecagon at a given side length, animations
  11. Tetradecagon, an animation from a neusis construction based on the angle trisection by means of the Tomahawk
  12. Tetradecagon with given side length, an animation from a neusis construction with marked ruler, according to David Johnson Leisk
  13. Pentadecagon, construction at a given circumcircle, construction at a given side length
  14. Hexadecagon, construction at a given side length
  15. Heptadecagon, construction according H. W. Richmond
  16. Heptadecagon according to Duane W. DeTemple with Carlyle Circles, animation
  17. Heptadecagon according to "sent by T. P. Stowell, credited to Leybourn's Math. Repository, 1818". and animation
  18. An animation of a neusis construction of a heptagon, based on Andrew M. Gleason, using angle trisection by means of the tomahawk
  19. Octadecagon, an animation of an approximate construction
  20. Octadecagon, an exact construction based on the angle trisection 120° by means of the tomahawk, animation
  21. Icosagon, the golden ratio in icosagon
  22. Squaring the circle, Construction by Jacob de Gelder
  23. Squaring the circle, Construction by Hobson
  24. Squaring the circle, Constructions by Ramanujan 1913
  25. Squaring the circle, Constructions by Ramanujan 1914, with continuation of the construction (dashed lines, mean proportional red line), animation
  26. Squaring the circle, Construction using the golden ratio
  27. Perpendicular, Construction of the perpendicular, Thales' theorem used, animation
  28. Right angle, Thales theorem, An application example in which the right angle and the Thales' theorem are included (see animation)
  29. Napolian's problem, A variation for a given distance respectively for a given segment
  30. Angle trisection with an auxiliary curve
  31. Geometric mean, image for the initiation
  32. Angle trisection with a right triangular ruler, trisection of the angle by means of the Rechtwinkelhaken according to Ludwig Bieberbach
  33. Bicentric quadrilateral, construction