Kusumastuti, Fitri Anisa, Muh. Khaedir Lutfi, and Yusup Junaedi. 2022. “Epistemological Obstacle on Triangle And Quadrilateral Topic”. Jurnal Pendidikan Dan Sains (JUPISI) 1 (2):8-10. https://doi.org/10.63494/jupisi.v1i2.133.