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Experimental geometry: a new look into old books. (Experimentelle Geometrie: ein neuer Blick in alte Bücher.) (German)
Math. Lehren 33, No. 196, 44-46 (2016).
Classification: G40 D40 A30 U20
1
Modification of the theorems by Thales and Pythagoras. (Modifikation der Sätze von Thales und Pythagoraster.) (German)
MNU J. 69, No. 2, 120-122 (2016).
Classification: G44 I24 I44
2
Thales’ theorem and its relatives. In which cases is a triangle acute, right, obtuse-angled? (Der Satz von Thales und seine Verwandten. Wann ist ein Dreieck spitzwinklig, rechtwinklig, stumpfwinklig?) (German)
Monoid 35, No. 124, 6-7 (2015).
Classification: G40
3
The handbook of the island. II: Surveying of inaccessible objects. (Das Handbuch der Meeresinsel. II: Vermessung unerreichbarer Objekte.) (German)
Monoid 35, No. 123, 5-9 (2015).
Classification: G40 A30 M50
4
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
5
Experimentally discovering the circumference angle theorem. (Den Umfangswinkel experimentell entdecken.) (German)
PM Prax. Math. Sch. 57, No. 65, 45-47 (2015).
Classification: G43 D43 D83 U73
6
Gaining knowledge through a synoptic view of contexts with similar structures. (Erkenntnisgewinn durch Zusammenschau strukturähnlicher Kontexte.) (German)
Mathematikunterricht 61, No. 4, 20-27 (2015).
Classification: E40 M10 D50 D40
7
A testimony of a school year organized around research approaches. An example of a station work on myopia. (Témoignage d’une année scolaire organisée autour de la démarche d’investigation. Exemple de parcours sur la myopie.) (French)
Repères IREM 97, 43-58 (2014).
Classification: M53 M63 G43 D43
8
Folding, mathematization. III. (Pliage, mathématisation. III.) (French)
Losanges 26, 3-11 (2014).
Classification: G40 U60 F50
9
Portrait of a didactic play: Euclidean hexagon ‒ the discovery of proving. (Lehrstückportrait: Euklids Sechsstern ‒ die Entdeckung des Beweisens.) (German)
Mathematikunterricht 59, No. 6, 24-25 (2013).
Classification: G43 D83 D43 A33
10
Only with a ruler: training the eye for geometry. (Nur mit Lineal: den geometrischen Blick schulen.) (German)
Math. Lehren, No. 171, 66-67 (2012).
Classification: G43 D83
11
3-D proofs of 2-D theorems. (English)
Math. Teach. (Derby), No. 229, 38-41 (2012).
Classification: G40
12
$\dots $ more than writing up a solution. Showing phases of geometrical proving processes. ($\dots $ mehr als nur die Lösung formulieren. Phasen des geometrischen Beweisprozesses aufzeigen.) (German)
Math. Lehren, No. 155, 43-49 (2009).
Classification: E53 D53 G43 Reviewer: Renate Stürmer (Zweibrücken)
13
How to generalize Thales’s theorem? (Den Satz von Thales verallgemeinern ‒ aber wie?) (German. English summary)
KoG 12, 7-18 (2008).
Classification: G40
14
Interpretation of Thales’ theorem with dimensional analysis methods. (Interpretación del teorema de Thales con los métodos del análisis dimensional.) (Spanish. English summary)
Bol., Soc. “Puig Adam" Profr. Mat., No. 77, 62-66 (2007).
Classification: G40
15
Teaching mathematics through its history: trigonometry. (Enseñar matemáticas a través de su historia: algunos conceptos trigonométricos.) (Spanish. English summary)
Epsilon (Puerto Real) 23, No. 67, 97-107 (2007).
Classification: G60 G40 U70 D40
16
Pappus - a juggler of proportions. (Pappus - en proportionernas jonglör.) (Swedish)
Normat. Nord. Mat. Tidskr. 53, No. 1, 13-20 (2005).
Classification: G40 A30
17
Equal arcs, triangles, and probability. (English)
Math. Teach. (Reston) 96, No. 9, 618-621 (2003).
Classification: D43 G43 K53
18
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