USMAN, Muhammad Rizal. Pengembangan Alat Peraga Papan Al-Sintacs Materi Trigonometri Siswa Kelas X MA DDI Galesong Baru. Delta-Pi: Jurnal Matematika dan Pendidikan Matematika, [S. l.], v. 9, n. 2, 2020. DOI: 10.33387/dpi.v9i2.2314. Disponível em: https://ejournal.unkhair.ac.id/index.php/deltapi/article/view/2314. Acesso em: 31 mei. 2026.