Santosa, F. H., Indrawati, I., Samsuriadi, S., & Safitri, W. S. (2026). Development of a Geoboard Assisted Supplementary Learning Book on Triangles and Quadrilaterals to Enhance Students’ Mathematical Understanding Ability. Jurnal Pemikiran Dan Penelitian Pendidikan Matematika (JP3M), 9(1), 41–51. https://doi.org/10.36765/jp3m.v9i1.949