M. P. CHAUDHARY. Note on the Properties of Trapezoid. Global Journal of Science Frontier Research, [S. l.], v. 16, n. F6, p. 53–57, 2016. Disponível em: https://journalofscience.org/index.php/GJSFR/article/view/1920. Acesso em: 6 may. 2024.