DEMIRCIOĞLU, H.; HATIP, K. Examining Students’ Proof Writing and Justification Skills in the Context of Sum of Measures of Polygons’ Interior Angles. International Electronic Journal of Elementary Education, [S. l.], v. 16, n. 1, p. 17–30, 2023. Disponível em: https://www.iejee.com/index.php/IEJEE/article/view/1997. Acesso em: 29 apr. 2025.