BRISEID, Eyvind; FORSSELL, Henrik; SMESTAD, Bjørn. Triangle and parallelogram area formulas: a critique of teacher education textbooks in Norway. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 30, n. 2, p. 44–67, 2025. DOI: 10.7146/nomad.v30i2.162158. Disponível em: https://tidsskrift.dk/NOMAD/article/view/162158. Acesso em: 26 dec. 2025.