<![CDATA[This research addresses students’ difficulties in learning three-dimensional (3D) geometry, particularly in developing spatial ability, which often leads to low academic performance. To overcome this issue, an augmented reality (AR)-based learning media for 3D geometry was developed using a Research and Development (R&D) approach based on the ADDIE model, consisting of analysis, design, development, implementation, and evaluation phases. The research instruments included validation sheets from media experts and subject matter experts, practitioner evaluation questionnaires, student response questionnaires, and post-test assessments. Data were analyzed using descriptive and quantitative methods to determine the validity and practicality of the product, while effectiveness was measured based on the percentage of students achieving the Minimum Mastery Criteria. The results indicated that the developed media is highly valid, with scores of 89.41% from media experts and 88.57% from subject matter experts. The practicality level is also high, with scores of 91% from practitioners, and 84% from student. In terms of effectiveness, 100% of students achieved scores above the Minimum Mastery Criteria. These findings suggest that AR-based learning media is valid, practice, and effective in supporting students understanding of 3D geometry and enhancing their spatial ability.]]>
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