User:Petrus3743
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 | at 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
- Born in 1943
- Austrian
- Since 1963 in Munich
- At work, I was first a motor mechanic, later through self-taught studies a state-certified technician and ultimately technologist for new manufacturings engineering at a major car manufacturer in Bavaria.
- In February 2012, I started with small contributions, often with the kind support of helpful colleagues. With fondness I create geometric drawings in GeoGebra for example polygons as Compass-and-straightedge construction and approximations with minimum deviations from the nominal value.
On a continued good work for Wikipedia!
My contributions are included in ...
[edit]- Square at a given side length and Square at a given diagonal (animations)
- Pentagon at a given side length and Euclid's method for pentagon at a given circle, using of the golden triangle, animation
- Hexagon at a given side length
- Heptagon, one animation shows a neusis construction by means of the tomahawk
- Heptagon, another animation shows a neusis construction by means of the marked ruler.
- Octagon at a given side length, animation
- Nonagon, Another two animations of an approximate construction
- Decagon at a given circumcircle and decagon at a given side length as animations, the golden ratio in decagon
- Hendecagon according to T. Drummond from 1800, approximation construction as an animation
- Dodecagon at a given side length, animations
- Tetradecagon, an animation from a neusis construction based on the angle trisection by means of the Tomahawk
- Tetradecagon with given side length, an animation from a neusis construction with marked ruler, according to David Johnson Leisk
- Pentadecagon, construction at a given circumcircle, construction at a given side length
- Hexadecagon, construction at a given side length
- Heptadecagon, construction according H. W. Richmond
- Heptadecagon according to Duane W. DeTemple with Carlyle Circles, animation
- Heptadecagon according to "sent by T. P. Stowell, credited to Leybourn's Math. Repository, 1818". and animation
- An animation of a neusis construction of a heptagon, based on Andrew M. Gleason, using angle trisection by means of the tomahawk
- Octadecagon, an animation of an approximate construction
- Octadecagon, an exact construction based on the angle trisection 120° by means of the tomahawk, animation
- Icosagon, the golden ratio in icosagon
- Squaring the circle, Construction by Jacob de Gelder
- Squaring the circle, Construction by Hobson
- Squaring the circle, Constructions by Ramanujan 1913
- Squaring the circle, Constructions by Ramanujan 1914, with continuation of the construction (dashed lines, mean proportional red line), animation
- Squaring the circle, Construction using the golden ratio
- Perpendicular, Construction of the perpendicular, Thales' theorem used, animation
- Right angle, Thales theorem, An application example in which the right angle and the Thales' theorem are included (see animation)
- Napolian's problem, A variation for a given distance respectively for a given segment
- Angle trisection with an auxiliary curve
- Geometric mean, image for the initiation
- Angle trisection with a right triangular ruler, trisection of the angle by means of the Rechtwinkelhaken according to Ludwig Bieberbach
- Bicentric quadrilateral, construction
