Barros, F., Alves, F., Mangueira, M., Vieira, R. and Catarino, P. 2020. Hybridization of triangular numbers: a preliminary and a priori analysis on visualization using the software GeoGebra. Indagatio Didactica. 12, 3 (Jul. 2020), 411-436. DOI:https://doi.org/10.34624/id.v12i3.20106.