Santosa FH, Indrawati I, Samsuriadi S, Safitri WS. Development of a Geoboard Assisted Supplementary Learning Book on Triangles and Quadrilaterals to Enhance Students’ Mathematical Understanding Ability. JP3M [Internet]. 2026 May 28 [cited 2026 May 29];9(1):41-5. Available from: https://journal.rekarta.co.id/index.php/jp3m/article/view/949