Exploring Gotong Simalungun’s Approach to Geometry Concepts at SMP Negeri 1 Dolok Batu Nanggar. JUPE : Jurnal Pendidikan Mandala, [S. l.], v. 10, n. 3, p. 1028–1031, 2025. DOI: 10.58258/jupe.v10i3.9330. Disponível em: https://ejournal.mandalanursa.org/index.php/JUPE/article/view/9330. Acesso em: 21 jun. 2026.