Ramadhania, D., Prayitno, S. ., Subarinah, S. ., & Arjudin, A. (2022). Analysis of mathematics problem-solving ability on plane figure subject based on van hieles theory at Junior High School. Jurnal Pijar Mipa, 17(4), 493–498. https://doi.org/10.29303/jpm.v17i4.3413