There have been many studies that have developed learning videos on trigonometric materials. However, no research has been found that has developed STEAM-integrated timestamp-based learning videos to improve students' understanding of trigonometric materials. Therefore, this study aims to develop learning media in the form of STEAM-integrated timestamp-based learning videos to improve students' understanding of trigonometric material. In addition, this study explains the development process and analyzes the effectiveness of STEAM-integrated timestamp-based learning videos in improving student understanding, especially on trigonometric materials. The type of research used is Research & Development (R&D) based on the ADDIE model. This study involved 39 students at SMA Batik 1 Surakarta who was randomly selected. The results found that posttest scores were better than pretest scores, which means that there was a significant difference between the average learning outcomes before and after using the learning video. From the learning videos that have been developed, it can be an alternative for educational practitioners, students and researchers in the field of mathematics as a learning support to make learning more effective.
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