<![CDATA[This study aims to develop mathematics learning media using Adobe Flash that are practical and effective in improving students’ mathematical reasoning abilities on trigonometry material. The research employed a Research and Development (R&D) approach using the ADDIE instructional design model, which consists of the stages of Analysis, Design, Development, Implementation, and Evaluation. The subjects of this study were eleventh-grade students of MAN 2 Model Medan. The research instruments included teacher and student response questionnaires to measure the practicality of the learning media, as well as tests of students’ mathematical reasoning abilities to determine its effectiveness. The results showed that the practicality of the Adobe Flash-based learning media, based on teacher and student responses after implementation, obtained an average score of 91%, which falls into the “very practical” category. Furthermore, the effectiveness of the media was indicated by the improvement in students’ mathematical reasoning test results, with an achievement percentage of 71%. A t-test analysis demonstrated that the calculated t-value (t_count = 12.96) was greater than the t-table value (t_table = 2.14), indicating a significant difference between pretest and posttest scores. These findings suggest that the Adobe Flash-based mathematics learning media are practical and effective for enhancing students’ mathematical reasoning abilities.]]>
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