Sabaniatun, Sabaniatun, Baiq Rika Ayu Febrilia, dan Eliska Juliangkary. 2019. “The Problem Solving Ability of Students on the Material Perimeter and Area of a Triangle”. Edumatica : Jurnal Pendidikan Matematika 9 (02):1-13. https://doi.org/10.22437/edumatica.v9i02.6074.