SONETA, Vidya; ., Nurjanah; PRABAWANTO, Sufyani. Learning Obstacles in the Concept of Quadrilateral Constructed Areas. KnE Social Sciences, [S. l.], v. 9, n. 13, p. 561–568, 2024. DOI: 10.18502/kss.v9i13.15959. Disponível em: http://thrillriftranks.com/index.php/KnE-Social/article/view/15959. Acesso em: 6 feb. 2025.