Ardila, Ayudita, Jefri Marzal, and Jodion Siburian. “Analisis Kemampuan Pemahaman Konsep Siswa Dalam Memahami Materi Trigonometri Kelas X IPS”. Jurnal Cendekia : Jurnal Pendidikan Matematika 6, no. 1 (January 22, 2022): 423-444. Accessed May 6, 2026. https://j-cup.org/index.php/cendekia/article/view/1064.