OXMAN, Victor. Proof Without Words: One Elegant Relationship Between the Angles Formed in an Acute Triangle. Ohio Journal of School Mathematics, [S. l.], v. 91, n. 1, p. 1, 2022. Disponível em: https://ohiomathjournal.org/index.php/OJSM/article/view/8844. Acesso em: 27 apr. 2024.