Sappari, S.O. , Ibarra, F.P. , Mukminin, A., Harto, K., Marzulina, L., Mulyono, H. and Asmendri, A. 2023. The Content-Validated Geometry Lessons in Islam Observed Brain-based Learning. Qubahan Academic Journal. 3, 4 (Nov. 2023), 153–168. DOI:https://doi.org/10.48161/qaj.v3n4a166.