ATRACTOR

Around the wheel

Beautiful triangles

Figures that tremble

Flat and spherical triangles

Morley′s Theorem

Morley′s Theorem: generalization

Napoleon Triangles

Polygonal sequence

Polygonal sequence: triangles

Polynomials versus polygons

Pythagorean Theorem and Trigonometry: Math without words

Regular stellated polyhedra

Spherical geometry: internal angles of a triangle

Spherical geometry: triangles

Triangles with multiple angles

Figuras que tremem, Gazeta de Matemática, 03/2018 (in Portuguese)

Incommensurability

Matemática Viva - Lemniscata de Bernoulli (in Portuguese)

Matemática Viva - Rolamento de hipérboles (in Portuguese)

Morley′s Theorem: parallelograms

Symmetry

Triângulos Belos, Gazeta de Matemática, 7/2015 (in Portuguese)

Triângulos com Ângulos Múltiplos, Gazeta de Matemática, 11/2012 (in Portuguese)

Versão do Teorema de Morley para Paralelogramos, Gazeta de Matemática, 7/2008 (in Portuguese)