Sari, Viainda, Tria Mardiana, and Septiyati Purwandari. 2021. “The Effect of The Tangram Media Assited STAD Model on The Understanding Of Mathematics Concepts Of Flat Building Materials”. Prosiding University Research Colloquium, December, 232-41. https://repository.urecol.org/index.php/proceeding/article/view/1756.