ATRACTOR

Flat and spherical triangles

Sphere projection

Spherical Geometry

Spherical geometry: Girard′s Theorem

Spherical geometry: Great circle

Spherical geometry: internal angles of a triangle

Spherical Geometry: Parallel postulate

Spherical geometry: Spherical Excess

Spherical geometry: triangles

The loxodrome

A Geometria do Planeta Terra, Ed. e Mat., 1,2/2013 (in Portuguese)

KaleidoTile

Rumos Magnéticos, Gazeta de Matemática, 7/2014 (in Portuguese)

Spherical geometry - materials for ProfMat12

Spherical Geometry - teaching materials