ABDUL ROHMAN, Harun. DERIVING THE EXACT FORMULA FOR PERIMETER OF AN ELLIPSE USING COORDINATE TRANSFORMATION. Alifmatika: Jurnal Pendidikan dan Pembelajaran Matematika, [S. l.], v. 4, n. 1, p. 1–16, 2022. DOI: 10.35316/alifmatika.2022.v4i1.1-16. Disponível em: https://journal.ibrahimy.ac.id/index.php/Alifmatika/article/view/1740. Acesso em: 22 jan. 2026.