Nasution, N.R. , Wahyudin, W. and Nurlaelah, E. 2023. Efforts to Improve Students’ Learning Outcomes Through Collaborative Learning: The Topic of Quadrilaterals. Mathline : Jurnal Matematika dan Pendidikan Matematika. 8, 3 (Aug. 2023), 1239–1258. DOI:https://doi.org/10.31943/mathline.v8i3.483.