“EFEKTIVITAS MODEL PROBLEM BASED LEARNING DAN DISCOVERY LEARNING BERBANTUAN TANGRAM TERHADAP KEMAMPUAN PEMECAHAN MASALAH MATEMATIKA SISWA SMP”, SENATIK, vol. 4, pp. 379–387, Aug. 2019, Accessed: Aug. 11, 2026. Available: https://conference.upgris.ac.id/index.php/senatik/article/view/83