Abdul Rohman, Harun. “DERIVING THE EXACT FORMULA FOR PERIMETER OF AN ELLIPSE USING COORDINATE TRANSFORMATION”. Alifmatika: Jurnal Pendidikan dan Pembelajaran Matematika 4, no. 1 (April 15, 2022): 1-16. Accessed December 5, 2024. https://journal.ibrahimy.ac.id/index.php/Alifmatika/article/view/1740.