Aprilia, S. et al. 2026. Needs Analysis and Hypothetical Learning Trajectory for Plane Geometry Through Obor Sewu Batik Ethnomathematics in Grade Iv. EduMatSains : Jurnal Pendidikan, Matematika dan Sains. 11, 2 (Oct. 2026), 231–240. DOI:https://doi.org/10.33541/edumatsains.v11i2.8761.