Sarjana K, Kertiyani NMI, Hayati L, Baidowi B. Developing instructional props to reinvent the area of parallelogram and triangle in online learning. BetaJTM [Internet]. 2023 May 31 [cited 2024 Dec. 9];16(1):1-13. Available from: https://jurnalbeta.ac.id/index.php/betaJTM/article/view/555