The Improvement of Geometric Thinking Levels of Secondary School Students Using Geometry Learning Video based on Van Hiele Theory

This work created an educational video named Video Pembelajaran Geometri (Geometry Learning Video = VPG). The video is intended to assist year 9 pupils in developing their Van Hiele geometrical thinking skills. In Parepare, South Celebes, Indonesia, VPG is designed as an alternative help to overcome the limitations of information and communication technology (ICT) usage. All themes in geometry for Indonesian Secondary School (Sekolah Menengah Pertama = SMP) are shown in VPG based on the Van Hiele learning paradigm in order to enable students who plan to continue their studies. VPG's effectiveness was evaluated on 180 students, with 90 students from level 0 (L0), 60 students from level 1 (L1), and 30 students from level 2 (L2). Analyses of the results of the adapted Van Hiele Geometry Test (VHGT) before and after VPG use revealed a substantial variation in the mean scores. It was also revealed that the majority of the students improved their geometric thinking level significantly.