Ardila, Ayudita, Jefri Marzal, and Jodion Siburian. 2021. “The Development of Flipped Classroom Model Trigonometry Learning Tools Improves Students’ Mathematical Communication Skills”. Edumatica : Jurnal Pendidikan Matematika 11 (03):65-77. https://doi.org/10.22437/edumatica.v11i03.14497.