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Everyone in the same distance. Understanding the essence of loci through own setups and with DGS. (Alle im gleichen Abstand. Das Wesen von Ortslinien durch eigene Aufstellungen und mit DGS begreifen.) (German)
Mathematik 5 bis 10 36, 38-41 (2016).
Classification: G43 U73
1
Angle bisectors: an algebraic approach. (English)
Consortium 110, 1-2 (2016).
Classification: G70
2
A supplement to Haga’s theorem. II. (Eine Ergänzung zum Satz von Haga. II.) (German)
Wurzel 50, No. 7, 158-162 (2016).
Classification: G40 G50
3
Angle perpendicular or mid-bisector? (Winkelsenkrechte oder Mittelhalbierende?) (German)
Wurzel 50, No. 7, 146-149 (2016).
Classification: G40
4
Discovering, applying, and extending Ceva’s theorem. (English)
Math. Teach. (Reston) 108, No. 8, 632-637 (2015).
Classification: G45 G75 U75
5
Thunder and lightning: understanding equidistance. (English)
Math. Teach. (Reston) 108, No. 6, 454-460 (2015).
Classification: G43 U73 M93
6
Three improvements of a geometric inequality. (Drei Verbesserungen einer geometrischen Ungleichung.) (German)
Wurzel 49, No. 11, 244-248 (2015).
Classification: G40 G70 G90
7
A geometric construction of $π$. I: Euler’s polygon. (Eine geometrische Konstruktion von $π$. I: Das Polygon von Euler.) (German)
Monoid 35, No. 123, 9-12 (2015).
Classification: G40 F50 N50
8
A geometric construction of $π$. II: Vièta’s formula. (Eine geometrische Konstruktion von $π$. II: Die Formel von Vièta.) (German)
Monoid 35, No. 124, 27-30 (2015).
Classification: F50 N50 G40
9
Mathematical creativity: the unexpected links. (English)
Math. Enthus. 12, No. 1-3, 417-464 (2015).
Classification: D50 E50 C40
10
Encounter with the mother line, an elegant origami problem of Kazuo Haga. (Ontmoeting met de moedervouw, een elegant origamiprobleem van Kazuo Haga.) (Dutch)
Uitwiskeling 30, No. 2, 3-8 (2014).
Classification: G40 U60
11
The Nagel point. (Der Nagel-Punkt.) (German)
Wurzel 48, No. 11, 238-239 (2014).
Classification: G40
12
Transversal theorems for triangles. (Transversalensätze beim Dreieck.) (German)
Mathematikunterricht 60, No. 4, 11-15 (2014).
Classification: G40 G70 U70
13
Voronoi diagrams ‒ the fascination of “cornered" circles. (Voronoi-Diagramme ‒ die Faszination “eckiger" Kreise.) (German)
PM Prax. Math. Sch. 56, No. 56, 35-39 (2014).
Classification: M13 G43 G93 D83
14
An inequality between the sides and the bisectors of a triangle. (O inegalitate între laturile şi bisectoarele unui triunghi.) (Romanian. English summary)
Gaz. Mat., Ser. B 118, No. 3, 116-118 (2013).
Classification: G40 G60
15
Counterexamples for cevian triangles. (English)
Math. Compet. 26, No. 2, 21-33 (2013).
Classification: G40 G70 E50
16
Perpendicular bisectors of triangle sides. (English)
Forum Geom. 13, 53-59 (2013).
Classification: G45
17
A new geometric inequality in triangles. (Eine neue geometrische Ungleichung im Dreieck.) (German)
Wurzel 47, No. 3-4, 56-59 (2013).
Classification: G40 G70 G90
18
The Euler line and Feuerbach\rq s point. II. (Die Eulergerade und Feuerbachs Punkt. II.) (German)
Wurzel 47, No. 2, 32-39 (2013).
Classification: G40 Reviewer: Peter Dürr (Linkenheim)
19
The Euler line and Feuerbach’s point. (Die Eulergerade und Feuerbachs Punkt.) (German)
Wurzel 47, No. 1, 16-22 (2013).
Classification: G40
20
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