YAMANSABEEDIN, N.; UGSONKID, S.; LERTAMORNPONG, C. The Effects of Discovery-Based Mathematics Instruction Using Circular Paper Folding Activities Focus on Grade 9 Students’ Problem-Solving Ability on Circles . Interdisciplinary Academic and Research Journal , Maha Sara Kham, TH., v. 6, n. 2, p. e290230, 2026. DOI: 10.60027/iarj.2026.e290230. Disponível em: https://so03.tci-thaijo.org/index.php/IARJ/article/view/290230. Acesso em: 16 sep. 2026.