WALTERS, K. Exploring Circle Area with Radius Squares (pp. 59--64). Ohio Journal of School Mathematics, [S. l.], v. 84, n. 1, 2020. Disponível em: https://www.osu.tests.sfulib4.publicknowledgeproject.org/index.php/OJSM/article/view/6998. Acesso em: 29 apr. 2026.