User:Petrus3743



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 ...

 * 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

