AFIF NORMA LIDYA; ENDANG ISTIKOMAH. POWTOON-BASED MATHEMATICS LEARNING MEDIA: VALIDATION STAGE OF THE PYTHAGOREAN THEOREM. Mathematics Research and Education Journal, [S. l.], v. 5, n. 1, p. 1–7, 2021. DOI: 10.25299/mrej.2021.vol5(1).9206. Disponível em: https://journal.uir.ac.id/index.php/JPM/article/view/9206. Acesso em: 21 jul. 2026.