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Alternative constructions in triangles. (Alternative Konstruktionen im Dreieck.) (German)
Wurzel 50, No. 3-4, 79-81 (2016).
Classification: G40
1
Regular polygons and polynomial curves. (English)
Math. Compet. 28, No. 2, 16-24 (2015).
Classification: I20
2
Triangles with segments of parabolas and sine curves. (Dreiecke mit Parabel- und Sinussegmenten.) (German)
MNU, Math. Naturwiss. Unterr. 68, No. 6, 343-346 (2015).
Classification: I44 I54
3
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
4
DuFay’s polygons inscribed and circumscribed to circles. (English)
Math. Sch. (Leicester) 43, No. 1, 29-31 (2014).
Classification: G40
5
Make four out of three ‒ from a triangle to a tetrahedron. (Aus Drei mach Vier ‒ Vom Dreieck zum Tetraeder.) (German)
Wurzel 47, No. 11, 242-245 (2013).
Classification: G40
6
Geometry of sum-difference numbers. (English)
Coll. Math. J. 43, No. 5, 408-409 (2012).
Classification: G45 F65
7
What is ‘random’? (Wat is ‘willekeurig’?) (Dutch)
Uitwiskeling 28, No. 3, 8-12 (2012).
Classification: K50 G40
8
Taxicab triangle incircles and circumcircles. (English)
Pi Mu Epsilon J. 13, No. 5, 299-305 (2011).
Classification: G90
9
A new theorem on any right-angled Cevian triangle. (English)
Math. Compet. 24, No. 2, 29-37 (2011).
Classification: G40
10
Thematic tests for grade 8, using the textbooks “Geometry 7-9” by A.V. Pogorelov. (Tematicheskie testy dlya 8 klassov, rabotayushchikh po uchebniku “Geometriya 7-9” A.V. Pogorelova.) (Russian)
Mat. Shk., No. 5, 12-19 (2010).
Classification: D73 G33 Reviewer: Elena Glukhova (Moskva)
11
On the history of trigonometric functions and Ptolemy’s calculations. (Z historie goniometrických funkcí Ptolemaiovy výpočty.) (Czech)
Učitel Mat. 17, No. 2, 66-80 (2009).
Classification: A30 G60
12
Triangles and parallelograms of equal area inside the hyperbola. (English)
Math. Spectr. 42, No. 2, 70-74 (2010).
Classification: G30 G40 G70 Reviewer: Gerd Walther (Kiel)
13
Circle theorems against the clock. (English)
Math. Teach. Inc. Micromath 2008, No. 207, 6-9 (2008).
Classification: G40 G20 E50
14
A search in the land of geometry. (Een zoektocht in meetkundeland.) (Dutch)
Euclides 81, No. 5, 260-262 (2006).
Classification: G30
15
The inscribed angle theorem for parabolas. (Der Umfangswinkelsatz für die Parabel.) (German)
Monoid 25, No. 83, 32-35 (2005).
Classification: G90 G70
16
Is there a relation between the circumcircle and incircle radius of a triangle? (Besteht eine Relation zwischen Um- und Inkreisradius eines Dreiecks?) (German)
MNU, Math. Naturwiss. Unterr. 58, No. 5, 276-277 (2005).
Classification: G40
17
Lunulae Hippocratis - not only in right-angled triangles. (Eine elementargeometrische Miniatur: Hippokrates-Möndchen nicht nur in rechtwinkligen Dreiecken.) (German)
Heinze, Aiso et al., Beiträge zum Mathematikunterricht 2004. Vorträge. Franzbecker, Hildesheim (ISBN 3-88120-384-2). 257-260 (2004).
Classification: G40
18
Lunulae Hippocratis - not only in right-angled triangles. (Die Möndchen des Hippokrates - nicht nur in rechtwinkligen Dreiecken.) (German)
MNU, Math. Naturwiss. Unterr. 57, No. 2, 71-75 (2004).
Classification: G40
19
Equal arcs, triangles, and probability. (English)
Math. Teach. (Reston) 96, No. 9, 618-621 (2003).
Classification: D43 G43 K53
20
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