<![CDATA[This study aims to describe the implementation of the Susat Suling media based on GeoGebra in supporting students’ understanding of the relationship between central angles and inscribed angles in circles. A descriptive quantitative method with a one-shot case study design was employed. The subjects of this study were 35 students from class XI IPS 1 at MAN 1 Lamongan. The instruments used included validation sheets and learning outcome tests. Expert validation results indicated that the Susat Suling media achieved a feasibility score of 87.7%, which falls into the 'Highly Feasible' category. Following its implementation in the classroom, data showed that 82.9% of students scored ≥70 on the post-test. These results suggest that the media effectively facilitated students’ understanding of the central and inscribed angle concepts in a more concrete and interactive manner. Thus, Susat Suling can serve as an innovative alternative for visual-based mathematics instruction]]>
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